Deep-sea sediment sampling device simultaneously realizing time sequence sampling under multiple environmental conditions

Abstract

This invention relates to deep-sea sampling technology, aiming to provide a deep-sea sediment sampling device that simultaneously performs time-series sampling under multiple environmental conditions. The device includes three in-situ sealed chambers and two injection modules mounted on a fixed structure. Each in-situ sealed chamber houses a time-series sampling module, comprising at least three sets of identical sampling units. Each sampling unit includes an oil-filled motor, a lead screw, and multiple nested sampling and storage cylinders. Each injection module includes an oil-filled motor, a lead screw, and a storage cylinder. Each injection module corresponds to one in-situ sealed chamber and is connected to a water sample storage space and a sample storage space via pressure-resistant hoses. Multiple batteries are installed in each in-situ sealed chamber to power the motors. This invention enables time-series sampling under multiple environmental conditions and long intervals, while maintaining temperature during device retrieval. The device can also acquire control samples under the same sampling conditions and monitor changes in sample parameters during the sampling process.

Description

Technical Field

[0001] This invention relates to deep-sea sampling technology, and in particular to a deep-sea sediment sampling device that can simultaneously perform time-series sampling under multiple environmental conditions. Background Technology

[0002] Natural gas hydrates, with their high content and low pollution, have attracted much attention due to their enormous energy potential and environmental effects. Natural gas hydrates can only exist stably under low temperature and high pressure conditions; changes in the external environment can easily lead to their decomposition, resulting in methane leakage. Therefore, studying methane leakage at the seawater-sediment interface is of significant theoretical and practical importance for natural gas hydrate exploration. Currently, the carbon cycle model of methane release from the seabed, especially the complex physicochemical-biological transformation of methane at the seawater-sediment interface, is poorly understood. Due to the difficulties of access and long cycles in deep-sea observation, large-scale observations face numerous challenges, including high costs and difficulties in maintaining large-scale instruments and equipment.

[0003] Methane released from the decomposition of seafloor hydrates undergoes complex biogeochemical processes, including emissions through typical cold seep activity, and may rise as bubbles or diffuse into the overlying water column. Furthermore, organic and inorganic carbon in seawater undergoes various forms of carbon deposition. Calculations of deep-sea carbon cycle fluxes involve the net carbon cycle flux at the sediment-seawater interface. Therefore, during sample collection and preservation, it is necessary to provide comparative reference conditions for carbon injection, carbon release, and in-situ environments to determine the carbon release and absorption fluxes of sediment samples. However, currently, no research findings on deep-sea sampling techniques under multiple reference conditions have been published.

[0004] Therefore, it is essential to develop a technology that enables long-term continuous in-situ sampling of deep-sea carbon storage processes and online monitoring of changes in chemical parameters for studying the mechanism of carbon storage processes in deep-sea environments. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a deep-sea sediment sampling device that can simultaneously perform time-series sampling under multiple environmental conditions.

[0006] To solve the technical problem, the solution of the present invention is:

[0007] A deep-sea sediment sampling device for simultaneously performing time-series sampling under multiple environmental conditions is provided, comprising: three in-situ sealed chambers and two injection modules installed on a fixed device;

[0008] The in-situ sealed chamber is a hollow cavity sealed at the top, with a cavity sealing plate at the bottom opening. A timing sampling module is installed inside the cavity, comprising at least three sets of sampling units with identical structures. Each sampling unit includes an oil-filled motor, a lead screw, and multiple nested sampling and storage cylinders. Each storage cylinder is embedded in a through hole in the cavity sealing plate with its bottom opening, and has a piston at its upper part and a flap valve at its opening. A sampling cylinder is nested inside each storage cylinder, with its upper end fixed below the piston; the inside of the sampling cylinder serves as a sample storage space. The output of the oil-filled motor is connected to the piston rod via a lead screw, enabling the sampling cylinder to move vertically within the storage cylinder. A pin-mounted motor, matching each sampling unit, is installed on the cavity sealing plate; its output is connected to each flap valve via an action switching mechanism to achieve valve opening and closing.

[0009] The injection module includes an oil-filled motor, a lead screw, and a storage cylinder. The storage cylinder is a cylindrical structure with closed ends and an internal piston. Below the piston is a water sample storage space. The outer shell of the oil-filled motor is connected to the storage cylinder through several support rods, and its output shaft drives the piston to move within the storage cylinder through the lead screw. Each injection module corresponds to an in-situ sealed chamber and is connected to the water sample storage space and the sample storage space through pressure-resistant hoses, respectively.

[0010] Each in-situ sealed chamber contains multiple batteries to power each motor.

[0011] As a preferred embodiment of the present invention, the fixing device is a frame structure; the three in-situ sealing chambers are arranged in a triangular axial parallel manner inside the frame structure, and the injection module is fixed on the frame structure.

[0012] As a preferred embodiment of the present invention, a T-shaped handle is provided on the top cover of the in-situ sealed chamber.

[0013] As a preferred embodiment of the present invention, the action switching mechanism includes a drive rod and a number of pins equal to the number of storage cylinders in the sampling unit; the pin motor is located on the cavity sealing plate at the center of each sampling unit, and the pins correspond one-to-one with the storage cylinders and are arranged around the pin motor; traction springs are respectively provided on the inner and outer sides of the flap valve, and the pins can keep the flap valve in the open state by being connected to the outer traction spring.

[0014] As a preferred embodiment of the present invention, the battery for powering the motor is directly disposed in the casing of each motor.

[0015] As a preferred embodiment of the present invention, in each sampling unit, the oil-filled motor is simultaneously matched with two nested structures of storage cylinders and sampling cylinders: the lower end of the lead screw is fixed to the center of the lead screw connecting plate, and the piston rods of the two sampling cylinders are fixedly connected to both ends of the lead screw connecting plate, so that one oil-filled motor can simultaneously drive the sampling cylinders in the two storage cylinders.

[0016] As a preferred embodiment of the present invention, the timing sampling module includes a motor fixing plate, and the oil-filled motors in each sampling unit are fixed to the motor fixing plate by several support rods; the lead screw is wrapped in a lead screw protective sleeve, and the two are clearance fit; the lead screw protective sleeve passes through the through hole on the motor fixing plate, and the two are tight fit.

[0017] As a preferred embodiment of the present invention, the device further includes a plurality of semiconductor cooling chips and a battery for powering them, which are connected by cables; the cold end of the semiconductor cooling chip is attached to the outside of its corresponding storage cylinder, and the hot end is fixed to the outside of the in-situ sealed chamber.

[0018] As a preferred embodiment of the present invention, the top of the in-situ sealed chamber is provided with a power supply drive control module and a monitoring signal acquisition module; the former includes a battery and a microcontroller, and is connected to the oil-filled motor in the sampling unit and the injection module, as well as the battery and the plug motor in the in-situ sealed chamber, respectively, via cables; the latter includes a battery and a microcontroller, and is connected to the multi-parameter sensors in each sampling cylinder via cables.

[0019] As a preferred embodiment of the present invention, the device further includes an accumulator with a built-in piston, which is connected to the inner cavity of each in-situ sealed chamber via a pressure-resistant hose.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The present invention can realize sampling under multiple environmental conditions.

[0022] The sampling device has multiple sampling tubes in three in-situ sealed chambers. It can create an environment with carbon dioxide solubility higher than that of the original seawater in one in-situ sealed chamber, and an environment with carbon dioxide solubility lower than that of the original seawater in another in-situ sealed chamber. The remaining in-situ sealed chamber is used to preserve the original seawater sampling environment and can monitor the original data as a control.

[0023] (2) The present invention can realize long-interval time-series sampling.

[0024] The sampling device contains multiple sampling units within each in-situ sealed chamber. At predetermined sampling time points, one set of sampling units in each chamber performs the sampling action. This method enables automated, time-series sampling over long intervals. The obtained samples have sufficiently long time intervals to meet the research needs regarding the decomposition of seabed hydrates.

[0025] (3) The present invention can obtain control samples under the same sampling conditions.

[0026] Each sampling unit employs a nested structure design where an oil-filled motor simultaneously matches two sets of storage and sampling cylinders. This allows for the simultaneous acquisition of two independent samples, providing a comparative reference for subsequent analysis and meeting diverse research needs.

[0027] (4) The present invention can monitor changes in sample parameters during the sampling process.

[0028] By using multi-parameter sensors installed in each sampling tube, the monitoring signal acquisition module can record the evolution of parameters such as carbon dioxide concentration, temperature, salinity, pH, and redox potential of the sample over time in different sealed environments, thereby providing reference data for subsequent scientific research.

[0029] (5) The present invention can achieve heat preservation during the device recycling process.

[0030] The sampling device features a semiconductor cooling chip on the storage cylinder, enabling active temperature control based on a thermoelectric cooler via a power supply-driven control module. This prevents temperature changes during the ascent from the seabed to the surface from affecting the sample. Attached Figure Description

[0031] Figure 1 This is a three-dimensional view of the overall structure of the present invention;

[0032] Figure 2 This is a bottom view of the device of the present invention;

[0033] Figure 3 This is a cross-sectional view of the injection module in the device of the present invention;

[0034] Figure 4 This is a cross-sectional view of the device of the present invention;

[0035] Figure 5 This is a three-dimensional view of the timing sampling module in the device of the present invention.

[0036] Figure 6 This is a schematic diagram of the action switching mechanism in the device of the present invention.

[0037] The attached diagram is labeled as follows: 1 Injection module; 1-1 Oil-filling motor; 1-2 Lead screw; 1-3 Support rod; 1-4 Piston; 1-5 Storage cylinder; 2 In-situ sealed chamber; 2-1 Power supply drive control module; 2-2 Monitoring signal acquisition module; 2-3 T-type handle; 2-4 Top cover; 3 Fixing device; 4 Timing sampling module; 4-1 Lead screw; 4-2 Lead screw connecting plate; 4-3 Sampling cylinder; 4-4 Flip valve; 4-5 Storage cylinder; 4-6 Semiconductor cooling chip; 4-7 Pin motor; 4-8 Motor fixing plate; 4-9 Battery; 4-10 Drive rod; 4-11 Pin. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] The serial numbers assigned to components in this application, such as "first" and "second," are merely for distinguishing the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] Device structure description:

[0042] As shown in the figure, the deep-sea sediment sampling device provided by the present invention, which can simultaneously perform time-series sampling under multiple environmental conditions, includes a frame structure fixing device 3, three in-situ sealed chambers 2 arranged in a triangular axial parallel manner inside the frame structure, and two injection modules 1 fixed on the frame structure.

[0043] The in-situ sealed chamber 2 is a hollow cavity with a sealed top and a cavity sealing plate at the bottom opening. A T-shaped handle 2-3 is provided on the top cover of the in-situ sealed chamber 2 for the underwater robot's grasping operation. Inside the cavity of the in-situ sealed chamber 2 is a timing sampling module 4, which includes three (or more) sampling units of the same structure and a motor mounting plate 4-8. Each sampling unit includes an oil-filled motor, a lead screw 4-1, a sampling cylinder 4-3, and a storage cylinder 4-5. The open end of the storage cylinder 4-5 is embedded in a through hole in the cavity sealing plate. The oil-filled motor is fixed to the motor mounting plate 4-8 by three support rods; the lead screw 4-1 is encased in a lead screw protective sleeve, with a clearance fit; the lead screw protective sleeve passes through a through hole in the motor mounting plate 4-8, with a tight fit. A piston is provided at the upper part of the storage cylinder 4-5, and a flap valve 4-4 is provided at the bottom opening end of the storage cylinder 4-5; the sampling cylinder 4-3 is nested inside the storage cylinder 4-5, and its upper end is fixed below the piston. The interior of the sampling cylinder 4-3 serves as a sample storage space; the output end of the oil-filled motor is connected to the upper end of the piston through the lead screw 4-1, which can drive the sampling cylinder 4-3 to move vertically up and down inside the storage cylinder 4-5 to perform the sampling action.

[0044] Optionally, the oil-filled motor in each sampling unit can also be matched with two nested structures of storage cylinders and sampling cylinders: the lower end of the lead screw 4-1 is fixed to the center of the lead screw connecting plate 4-2, and the piston rods of the two sampling cylinders 4-3 are fixedly connected to the two ends of the lead screw connecting plate, so that one oil-filled motor can drive the sampling cylinders in the two storage cylinders at the same time.

[0045] The structure of an example of an action switching mechanism is as follows: Figure 6 As shown. The action switching mechanism includes a drive rod 4-10 and pins 4-11 in the same number as the storage cylinders 4-5 in the sampling unit; the pin motor 4-7 is located on the cavity sealing plate at the center of each sampling unit, and the pins 4-11 correspond one-to-one with the storage cylinders 4-5 and are arranged around the pin motor 4-7; traction springs are respectively set on the inner and outer sides of the flap valve 4-4, and each pin 4-11 is connected to the outer traction spring, which can keep the flap valve 4-4 in the open state. The drive rod 4-10 and the output end of the pin motor 4-7 are axially perpendicularly connected.

[0046] After the sampling cylinder 4-3 performs the sampling action by extending and retracting, the pin motor 4-7 rotates and drives the drive rod 4-10 to rotate. When the drive rod 4-10 rotates to the direction of the sampling cylinder 4-3, which has completed the sampling action, its end is inserted into the corresponding pin 4-11. Continued rotation will actuate the pin 4-11, causing it to release the outer traction spring. The flap valve 4-4 will then close under the elastic force of the inner traction spring, thereby creating a sealed environment inside the storage cylinder 4-5.

[0047] The injection module 1 includes an oil-filled motor, a lead screw 1-2, and a storage cylinder 1-5. The storage cylinder 1-5 is a cylindrical structure closed at both ends and contains a piston 1-4. Below the piston 1-4 is a water sample storage space. The housing of the oil-filled motor is connected to the storage cylinder 1-5 via several support rods 1-3, and its output shaft drives the piston 1-4 to move within the storage cylinder via the lead screw 1-2. Each injection module 1 corresponds to an in-situ sealed chamber 2 and is connected to the water sample storage space and the sample storage space via pressure-resistant hoses, respectively.

[0048] Each in-situ sealed chamber 2 is equipped with multiple batteries, which are used to power various electrical devices or components. Optionally, there are multiple batteries, among which batteries 4-9 that power the motors are directly installed in the casing of each motor.

[0049] Considering the need for heat preservation during the recycling process, the device is also equipped with several semiconductor cooling chips 4-6 and batteries that power them, which are connected by cables; the cold end of the semiconductor cooling chip 4-6 is attached to the outside of its corresponding storage cylinder 4-5, and the hot end is fixed to the outside of the in-situ sealed chamber 2.

[0050] Considering the pressure maintenance requirements during the recovery process, the device is also equipped with an accumulator (not shown in the figure) with a built-in piston. The accumulator is connected to the inner cavity of each in-situ sealed chamber via a pressure-resistant hose. A sealing ring is installed at the bottom of the storage cylinder 4-5, and the flap valve 4-4 is fitted with the sealing ring for sealing. The focus of this invention is on monitoring the entire process of in-situ carbon morphology changes in the abyss; therefore, precise pressure maintenance is not required for sampling.

[0051] At the top of the in-situ sealed chamber 2, there is a power supply drive control module 2-1 and a monitoring signal acquisition module 2-2. The power supply drive control module 2-1 includes a battery and a microcontroller, which are connected to various electrical devices or components (such as the oil-filled motor in the sampling unit and injection module 1, the pin motor in the in-situ sealed chamber 2, and the semiconductor cooling chip 4-6) via cables. The monitoring signal acquisition module 2-2 includes a battery and a microcontroller, which are connected to multi-parameter sensors in each sampling cylinder 4-3 via cables.

[0052] A single-chip microcomputer (MCU) is an integrated circuit chip that uses very large-scale integrated circuit technology to integrate a central processing unit (CPU) with data processing capabilities, random access memory (RAM), read-only memory (ROM), multiple I / O ports, an interrupt system, timers / counters, and other functions (and can also be configured with display driver circuits, pulse width modulation circuits, analog multiplexers, A / D converters, etc., as needed). This invention can, according to the needs of sampling and monitoring, write the execution flow of each motor action, monitoring signal acquisition and data conversion, and thermoelectric cooler temperature regulation into the MCU in software form. All operations of the sampling device are automatically executed by the power supply drive control module 2-1 according to preset time nodes based on the built-in software. Since the implementation method of this part is not within the scope of protection of this invention, and those skilled in the art can implement it as needed using their proficient technical means, this invention will not elaborate further.

[0053] Instructions for use:

[0054] 1. Preparations:

[0055] (1) Assemble the injection module 1, the in-situ sealed chamber 2, the fixing device 3, and the accumulator, and build the sampling device.

[0056] Connect the pins 4-11 in all sampling units to the outer traction springs of their respective flap valves 4-4, so that all flap valves 4-4 remain open.

[0057] Connect the two injection modules 1 to the corresponding in-situ sealed chambers 2 using PEEK pressure-resistant hoses, connect the water sample storage space to the corresponding sample storage space, and then close the valves and ensure a seal.

[0058] (2) Saturated carbon dioxide water and distilled water are injected into the storage cylinders 1-5 of the two injection modules 1, respectively.

[0059] (3) The sampling device is mounted on an underwater robot, which then lowers it to a pre-set sampling location on the seabed using its robotic arm;

[0060] 2. Sampling process:

[0061] (1) Implementation of sampling under multiple environmental conditions:

[0062] The underwater robot grasps the T-shaped handle 2-3, places the sampling device on a suitable seabed surface, and presses it down so that its bottom is fully inserted into the seawater-sediment interface, creating an in-situ seawater sampling environment. The oil-filled motor 1-1 drives the lead screw 1-2 to move the piston 1-4 in a linear motion, injecting the water sample from the storage cylinder 1-5 into the corresponding in-situ sealed chamber 2 through the PEEK pressure-resistant hose, and filling each sampling cylinder 4-3.

[0063] In this way, an environment with higher carbon dioxide solubility than the original seawater can be created in one in-situ sealed chamber 2, while an environment with lower carbon dioxide solubility than the original seawater can be created in another in-situ sealed chamber 2. The remaining in-situ sealed chamber 2 is used to retain the original seawater sampling environment. In this way, monitoring data and sample analysis comparisons under multiple environmental sampling conditions can be achieved.

[0064] (2) Implementation of long-interval time-series sampling:

[0065] At the set sampling time node, each of the three in-situ sealed chambers 2 has a set of sampling units performing sampling actions: the oil-filled motor drives the lead screw 4-1 to press down the piston so that the sampling cylinder 4-3 penetrates the seawater-sediment interface for sampling; then the piston is lifted to retrieve the sampling cylinder 4-3 into the storage cylinder 4-5, and the pin motor 4-7 drives the action switching mechanism to close the corresponding flap valve 4-4.

[0066] After the first set time interval (e.g., two weeks), the above sampling operation is repeated using the second set of sampling units in each in-situ sealed chamber 2; after the second set time interval (e.g., two weeks), the above sampling operation is repeated using the third set of sampling units in each in-situ sealed chamber 2.

[0067] This method enables automated time-series sampling at long intervals. The obtained samples have sufficiently long time intervals to meet the research needs for studying the decomposition of seabed hydrates.

[0068] (3) Obtain control samples:

[0069] Each sampling unit employs a nested structure design where an oil-filled motor simultaneously matches two sets of storage and sampling cylinders. During sampling, two independent samples can be acquired at the same time, providing a comparative reference for subsequent analysis and meeting diverse research needs.

[0070] (4) Monitor changes in sample parameters during the sampling process:

[0071] Through the multi-parameter sensors 2-2 installed in each sampling cylinder 4-3, the monitoring signal acquisition module 2-2 can record the evolution of parameters such as carbon dioxide concentration, temperature, salinity, pH, and redox potential of the sample over time in different sealed environments, thereby providing reference data for subsequent scientific research.

[0072] (5) Heat preservation during the device recovery process:

[0073] At the designated sampling end time, the sampling device is retrieved by an underwater robot deployed from the mother ship. During the ascent from the seabed to the surface, significant temperature changes occur. To avoid affecting the samples, active temperature control based on a thermoelectric cooler is employed to maintain the sample temperature during retrieval. The cold end of the semiconductor cooling chip 4-6 is attached to the storage cylinder 4-5, while its hot end exchanges heat with seawater during retrieval. The sample is transferred under heat and pressure on the mother ship and used for laboratory testing and detailed analysis.

[0074] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this invention should be considered within the scope of protection of this invention.

Claims

1. A deep-sea sediment sampling device for simultaneously performing time-series sampling under multiple environmental conditions, characterized in that, It includes a fixing device, three in-situ sealed chambers mounted on the fixing device, and two injection modules; wherein, Of the three in-situ sealed chambers, one is used to retain the in-situ seawater environment as a control environment, and the other two are respectively connected to the two injection modules to form two different in-situ sealed sampling environments in addition to the control environment. Each of the aforementioned in-situ sealed chambers is a hollow cavity with a sealed top and a cavity sealing plate at its bottom opening. A time-series sampling module is located inside. The time-series sampling module includes at least three sets of sampling units with identical structures. Each sampling unit includes an oil-filled motor, a lead screw, a storage cylinder, and a sampling cylinder. The storage cylinder is embedded in a through hole in the cavity sealing plate with its bottom opening. A piston is located on its upper part, and a flap valve is located at its opening. The sampling cylinder is nested inside the storage cylinder, with its upper end fixed below the piston, forming a sample storage space inside. The output of the oil-filled motor is connected to the piston rod via a lead screw to drive the sampling cylinder to make vertical displacement within the storage cylinder to complete sampling. Each of the aforementioned in-situ sealed chambers is sampled by one set of sampling units at a preset sampling time node to synchronously obtain time-series samples at corresponding time nodes under different environmental conditions. A pin motor, matching each sampling unit, is located on the cavity sealing plate. Its output is connected to each flap valve via an action switching mechanism. After the corresponding sampling unit completes sampling, it drives the flap valve to close, forming a sealed sample within the storage cylinder. Each of the injection modules includes an oil-filled motor, a lead screw, and a storage cylinder; the storage cylinder is a cylindrical structure with closed ends and an internal piston, and a water sample preservation space is formed below the piston; the injection module is connected to the sample preservation space in the corresponding in-situ sealed chamber through a pressure-resistant hose, and is used to provide water samples to the corresponding in-situ sealed chamber to construct different environments; The in-situ sealed chamber is equipped with multiple batteries and multi-parameter sensors; the batteries are used to power each motor, and the multi-parameter sensors are connected to a monitoring signal acquisition module to record the changes of sample parameters over time in different sealed environments.

2. The sampling device according to claim 1, characterized in that, The fixing device is a frame structure; the three in-situ sealed chambers are arranged in a triangular axial parallel manner inside the frame structure, and the injection module is fixed on the frame structure.

3. The sampling device according to claim 1, characterized in that, A T-shaped handle is provided on the top cover of the in-situ sealed chamber.

4. The sampling device according to claim 1, characterized in that, The action switching mechanism includes a drive rod and a number of pins equal to the number of storage cylinders in the sampling unit; the pin motor is located on the cavity sealing plate at the center of each sampling unit, and the pins correspond one-to-one with the storage cylinders and are arranged around the pin motor; traction springs are respectively provided on the inner and outer sides of the flap valve, and the pins can keep the flap valve in the open state by being connected to the outer traction spring.

5. The sampling device according to claim 1, characterized in that, The batteries that power the motors are directly housed within the casing of each motor.

6. The sampling device according to claim 1, characterized in that, In each sampling unit, the oil-filled motor is matched with two nested structures of storage cylinders and sampling cylinders: the lower end of the lead screw is fixed to the center of the lead screw connecting plate, and the piston rods of the two sampling cylinders are fixedly connected to the two ends of the lead screw connecting plate, so that one oil-filled motor can drive the sampling cylinders in the two storage cylinders at the same time.

7. The sampling device according to claim 1, characterized in that, The timing sampling module includes a motor mounting plate, and the oil-filled motors in each sampling unit are fixed to the motor mounting plate by several support rods; the lead screw is wrapped in a lead screw protective sleeve, and the two are clearance fit; the lead screw protective sleeve passes through the through hole on the motor mounting plate, and the two are tight fit.

8. The sampling device according to claim 1, characterized in that, The device also includes several thermoelectric coolers and batteries that power them, which are connected by cables; the cold end of the thermoelectric cooler is attached to the outside of its corresponding storage cylinder, and the hot end is fixed to the outside of the in-situ sealed chamber.

9. The sampling device according to claim 1, characterized in that, The top of the in-situ sealed chamber is equipped with a power supply drive control module and a monitoring signal acquisition module; the former includes a battery and a microcontroller, and is connected to the oil-filled motor in the sampling unit and injection module, as well as the battery and plug motor in the in-situ sealed chamber, respectively, via cables; the latter includes a battery and a microcontroller, and is connected to the multi-parameter sensors in each sampling tube via cables.

10. The sampling device according to any one of claims 1 to 9, characterized in that, The device also includes an accumulator with a built-in piston, which is connected to the inner cavity of each in-situ sealed chamber via a pressure-resistant hose.

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