Deep-sea sediment sampling device and control method

Abstract

The invention discloses a deep-sea sediment sampling device and a control method, the device comprises a sampling cabin, a buoyancy buffer module and a bottom sitting module, an electronic level meter and a control device are arranged in the sampling cabin, and a height gauge is arranged at the bottom of the sampling cabin; the buoyancy buffer modules are arranged on the periphery of the sampling cabin, the bottom-sitting module is arranged at the bottom of the sampling cabin, an inductor is arranged at the bottom of the bottom-sitting module, and the signal output ends of the electronic level meter, the height gauge and the inductor are connected with the signal input end of the control device. The signal output end of the control device is connected with the control ends of the buoyancy buffering module and the bottom sitting module. According to the invention, the sampling efficiency of deep sea surface sediments, the fidelity of in-situ samples and the working capacity of seabed complex terrains can be effectively improved, meanwhile, the service life of ocean equipment is prolonged, the use frequency and the sampling efficiency of the equipment are improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of deep-sea sediment sampling, and more specifically, to a deep-sea sediment sampling device and a control method. Background Art

[0002] The interaction between surface sediments and bottom water in the deep-sea environment is a key interface for research in many fields, including biology, geochemical cycles, minerals, and energy. However, considering the extreme conditions of the deep sea, such as high pressure and low temperature, it is usually necessary to deploy large equipment such as grab buckets and gravity columns to collect deep-sea surface sediment samples, and use gravity to knock the equipment into the sediment to collect samples. This kind of hard bottom operation not only has serious disturbances to the sediments, especially the surface sediments, resulting in distortion of the biological and chemical elements of the in-situ samples, but also causes impact damage to the sampling device after repeated use, affecting the service life and maintenance cost of the device. Therefore, how to avoid hard bottoming is a key technology to avoid disturbance of the sampling site and the life of the sampling device.

[0003] Deep-sea sampling equipment is usually large in size, heavy, and difficult to control due to the need for waterproofing and pressure resistance. Therefore, soft landing on the seabed and low-disturbance sampling technology are one of the difficulties faced by existing marine sampling devices. Deep-sea sampling devices are usually fixed and controlled using ship-based cables during use, but the cable control accuracy is low, making it difficult to perform precise operations on the complex terrain of the seabed. At the same time, the complex terrain structure of the seabed places extremely high demands on the stable operation of the sampling device. The horizontal posture of the device is a key factor in applying force during sediment sampling, which greatly affects the sampling stability of the device and the accuracy of the sediment sampling depth. Summary of the invention

[0004] One of the purposes of the present invention is to provide a deep-sea sediment sampling device to solve the technical problem in the prior art that the sampling device is rigidly seated on the bottom, causing serious disturbance and resulting in distortion of biological, chemical and other elements of the in-situ sample; the second purpose of the present invention is to provide a control method for the deep-sea sediment sampling device.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A first aspect of the present invention provides a deep-sea sediment sampling device, characterized in that it comprises a sampling cabin, a buoyancy buffer module and a bottom-sitting module, wherein:

[0007] An electronic level and a control device are provided in the sampling cabin, and an altimeter is installed at the bottom of the sampling cabin;

[0008] The buoyancy buffer module is installed around the sampling cabin, the bottom seating module is installed at the bottom of the sampling cabin, a sensor is installed at the bottom of the bottom seating module, the signal output ends of the electronic level, altimeter and sensor are connected to the signal input end of the control device, and the signal output end of the control device is connected to the control end of the buoyancy buffer module and the bottom seating module.

[0009] In the above-mentioned technical means, the buoyancy buffer module is used to generate buoyancy, thereby reducing the descent speed of the sampling equipment and alleviating the impact force of the sampling equipment landing on the bottom; the overall horizontal state of the deep-sea sediment sampling device is indicated by the electronic level, which is used to keep the balance system horizontal when the buoyancy control is turned on, thereby realizing horizontal posture control and preventing the device from tipping over due to the shift of the center of gravity due to uneven posture during the landing process.

[0010] Furthermore, the buoyancy buffer module includes a plurality of propellers, a plurality of buffer wing plates and a plurality of propeller thrust compartments corresponding to the plurality of propellers one by one, the plurality of propeller thrust compartments are symmetrically arranged in the sampling cabin, the plurality of propellers are respectively installed in the corresponding propeller thrust compartments, the plurality of buffer wing plates are respectively symmetrically arranged on the outer wall of the sampling cabin, and the rotation speed of the plurality of propellers is controlled by the control device.

[0011] Furthermore, the buoyancy buffer module also includes a wing plate telescopic rod and a waterproof and pressure-resistant groove, the wing plate telescopic rod is installed in the waterproof and pressure-resistant groove and fixedly connected to the buffer wing plate, and the extension and retraction of the wing plate telescopic rod is controlled by the control device.

[0012] Furthermore, the opening direction of the waterproof and pressure-resistant groove is at a preset angle.

[0013] Furthermore, the base module includes a supporting bracket and a base seat, the supporting bracket is fixed to the bottom of the sampling cabin, and the base seat is provided at the bottom of the supporting bracket.

[0014] Furthermore, the base module also includes a telescopic rod, and the bottom of the supporting bracket is connected to the base seat through the telescopic rod. The sensor is arranged between the telescopic rod and the bottom of the supporting bracket to detect the extension degree of the telescopic rod.

[0015] A second aspect of the present invention provides a control method for a deep-sea sediment sampling device, characterized in that the control method is applied to the deep-sea sediment sampling device, and the control method comprises the following steps:

[0016] The sampling cabin is connected to the ship base and the rope is lowered into the sea, and the sampling cabin begins to sink;

[0017] When the altimeter detects that the sampling cabin descends to the near-bottom depth M1, the control device starts the buoyancy buffer module to provide buoyancy;

[0018] The control device sets the size of the buoyancy provided by the buoyancy buffer module according to the sinking speed of the sampling cabin and the horizontal posture of the sampling cabin monitored by the electronic level, so that the sampling cabin sinks in a horizontal posture;

[0019] When the sampling cabin sinks in a horizontal posture, the buoyancy provided by the buoyancy buffer module is gradually reduced until it reaches 0;

[0020] The sampling cabin is buffered and descends until the bottom seating module is seated.

[0021] Further, the control device starts the buoyancy buffer module to provide buoyancy, including:

[0022] The control device starts the plurality of propellers and unfolds the buffer wing to a maximum unfolding area.

[0023] Further, unfolding the buffer wing panel to a maximum unfolding area includes:

[0024] The control device activates the wing panel telescopic rod to unfold the buffer wing panel to a maximum unfolding area.

[0025] Further, the buoyancy provided by the buoyancy buffer module is set so that the sampling cabin sinks in a horizontal posture, including:

[0026] The horizontal posture of the sampling cabin during the sinking process is in a three-axis tilt state. First, the horizontal posture of the sampling cabin is monitored according to the electronic level. The propeller speed on the side with the highest tilt angle in the longitudinal axis of the sampling cabin is used as the reference datum X1, and the speed of the other propeller is increased and synchronized to X2, X2>X1, so that the longitudinal axis of the sampling cabin is at the same level, and then the propeller speed is controlled to X1 to provide consistent buoyancy; at this time, the horizontal posture of the sampling cabin is in a tilted state of the transverse axis. The propeller on the side with the highest tilt angle of the transverse axis indicated by the horizontal electronic instrument is used as the reference datum X1, and the speed of the other propeller is increased to X2, X2>X1 to provide buoyancy to adjust the tilt angle of the transverse axis to a horizontal state, and then the propeller speed is controlled to X1 to provide consistent buoyancy, thereby completing the horizontal posture adjustment of the sampling cabin.

[0027] Furthermore, the bottom-sitting module bottom-sitting also includes the following steps:

[0028] Before the base seat is seated, the telescopic rod maintains the maximum length. When the base seat is seated, the sensor receives whether the telescopic rod rebounds to indicate whether the base seat is seated successfully.

[0029] After the base seat is successfully seated, the buffer wing plate is retracted;

[0030] The control device adjusts the extension amount of the telescopic rod according to the horizontal posture of the sampling cabin monitored by the electronic level until the sampling cabin reaches a horizontal posture.

[0031] Further, adjusting the extension amount of the telescopic rod until the sampling cabin reaches a horizontal posture includes:

[0032] The horizontal posture of the sampling cabin is monitored by an electronic level, and the two telescopic feet on the side of the highest inclination angle of the longitudinal axis of the telescopic rod are used as reference datums. The other two telescopic feet are raised and synchronized to be at the same level as the telescopic feet of the reference datum. At this time, the horizontal posture of the device is in an inclined state of the horizontal axis. The two telescopic feet on the side of the highest inclination angle of the horizontal axis indicated by the horizontal electronic instrument are used as reference datums. The other two telescopic feet are raised and synchronized to be at the same level as the telescopic feet of the reference datum, thereby completing the horizontal posture adjustment of the device.

[0033] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0034] The present invention uses a buoyancy buffer module to control deceleration and hovering of the sampling cabin in the near-bottom water layer, thereby reducing the impact force of the device landing on the bottom. Compared with the existing technology, the present invention has active buoyancy control capability, and can more flexibly arrange the time and depth of water layer for buffering and deceleration during the release of the device, thereby improving the applicability of the device to different task requirements. At the same time, relying on the buoyancy buffer module and the bottom seating module, the stable soft landing of the sampling cabin is guaranteed, the maintenance cost of the device is reduced, and the service life of the device is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a deep-sea sediment sampling device provided by an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the top structure of a deep-sea sediment sampling device provided by an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the connection between the buffer wing plate and the wing plate telescopic rod provided in an embodiment of the present invention;

[0038] Figure 4 A schematic flow chart of a control method for a deep-sea sediment sampling device provided in an embodiment of the present invention.

[0039] Figure 5 A schematic diagram of horizontal posture control of a deep-sea sediment sampling device provided in an embodiment of the present invention;

[0040] Figure 6A schematic diagram of a deep-sea sediment sampling device provided in an embodiment of the present invention.

[0041] In the figure, 1 is a sampling cabin, 2 is a propeller, 3 is a propeller thrust cabin, 4 is a wing panel telescopic rod, 5 is a buffer wing panel, 6 is a 4-legged support bracket, 7 is a 4-legged telescopic rod, 8 is a base seat, 9 is a bottom support plate, 11 is a control device, 12 is an altimeter, 13 is an electronic level, 14 is a wing panel connection point, and 15 is a fixed connection plate. DETAILED DESCRIPTION

[0042] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0043] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0044] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0045] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0046] Example 1

[0047] This embodiment provides a deep-sea sediment sampling device, such as Figure 1 As shown, it includes a sampling cabin 1, a buoyancy buffer module and a bottom sitting module, wherein:

[0048] An electronic level 13 and a control device 11 are provided in the sampling cabin 1, and an altimeter 12 is installed at the bottom of the sampling cabin 1;

[0049] The buoyancy buffer module is installed around the sampling cabin 1, and the bottom seating module is installed at the bottom of the sampling cabin 1. A sensor is installed at the bottom of the bottom seating module. The signal output ends of the electronic level 13, the altimeter 12 and the sensor are connected to the signal input end of the control device 11, and the signal output end of the control device 11 is connected to the control end of the buoyancy buffer module and the bottom seating module.

[0050] During the specific implementation process, the buoyancy buffer module generates buoyancy, thereby reducing the descent speed of the sampling cabin 1 and alleviating the impact force of the sampling cabin 1 landing on the bottom. The buoyancy buffer module controls the size of the buoyancy to accurately control the changes in the descent speed in different states. The buoyancy buffer module is equipped with an electronic level 13, which is used to indicate the overall horizontal state of the sampling cabin 1, and is used to keep the balancing device horizontal when the buoyancy control is turned on, to achieve horizontal posture control, and to prevent the device from tipping over due to the shift of the center of gravity due to uneven posture during the landing process. The function of the landing module is to achieve low-disturbance landing of the sampling cabin 1.

[0051] Example 2

[0052] This embodiment provides a deep-sea sediment sampling device, including a sampling cabin 1, a buoyancy buffer module and a bottom-sitting module, wherein:

[0053] An electronic level 13 and a control device 11 are provided in the sampling cabin 1, and an altimeter 12 is installed at the bottom of the sampling cabin 1;

[0054] The buoyancy buffer module is installed around the sampling cabin 1, and the bottom seating module is installed at the bottom of the sampling cabin 1. A sensor is installed at the bottom of the bottom seating module. The signal output ends of the electronic level 13, the altimeter 12 and the sensor are connected to the signal input end of the control device 11, and the signal output end of the control device 11 is connected to the control end of the buoyancy buffer module and the bottom seating module.

[0055] In a further embodiment, the buoyancy buffer module also includes a plurality of propellers 2, a plurality of buffer wing plates 5 and a plurality of propeller thrust compartments 3 corresponding one to the plurality of propellers, the plurality of propeller thrust compartments 3 are symmetrically arranged in the sampling cabin 1, the plurality of propellers 2 are respectively installed in the corresponding propeller thrust compartments 3, the plurality of buffer wing plates 5 are respectively symmetrically arranged on the outer wall of the sampling cabin 1, and the rotation speed of the plurality of propellers 2 is controlled by the control device 11.

[0056] In this embodiment, two propeller thrust cabins 3 are respectively arranged on the two long sides of the sampling cabin 1. Figure 2 As shown, there are a total of 4 propeller thrust cabins 3, which are used to install propellers 2 and assist the propellers 2 in pushing seawater to form water flow to generate buoyancy during operation, thereby reducing the descent speed of the sampling cabin 1 and reducing the impact force of the sampling cabin 1 landing on the bottom. The propeller 2 can adjust the speed to control the size of the buoyancy so as to accurately control the change of the descent speed in different states. The sampling cabin 1 is equipped with an electronic level 13, which is used to indicate the overall horizontal state of the sampling cabin 1 and to keep the balancing device horizontal when the buoyancy control is turned on. The speed adjustment after the 4 propellers 2 are started can realize the horizontal posture control to prevent the device from tipping over due to the shift of the center of gravity due to the uneven posture during the landing process.

[0057] In a further embodiment, the buoyancy buffer module also includes a wing plate telescopic rod 4 and a waterproof and pressure-resistant groove, the wing plate telescopic rod 4 is installed in the waterproof and pressure-resistant groove and fixedly connected to the buffer wing plate 5, and the extension and retraction of the wing plate telescopic rod 4 is controlled by the control device 11.

[0058] In this embodiment, the buffer wing plate 5 is fixedly connected to the sampling cabin 1 via the wing plate telescopic rod 4, and the wing plate telescopic rod 4 is used to control the deployment and retraction of the buffer wing plate 5.

[0059] In a further embodiment, the opening direction of the waterproof and pressure-resistant groove is at a preset angle.

[0060] In this embodiment, a waterproof and pressure-resistant groove is provided inside the sampling cabin 1 for installing the wing telescopic rod 4. The opening direction of the waterproof and pressure-resistant groove is at a certain angle, so that the buffer wing 5 can be closely attached to the side of the electronic cabin when it is retracted, so as to prevent the buffer wing 5 from passively protruding due to the structure and affecting the water flow and generating resistance, thereby reducing the descending speed of the sampling cabin 1 when it needs to be quickly launched, such as Figure 3 shown.

[0061] In a further embodiment, the base module further includes a supporting bracket and a base seat 8, the supporting bracket is fixed to the bottom of the sampling cabin 1, and the base seat 8 is provided at the bottom of the supporting bracket.

[0062] In a specific embodiment, the support bracket is a 4-legged support bracket 6.

[0063] In this embodiment, the function of the bottom seating module is to achieve low-disturbance bottom seating for the sampling cabin 1. The four-legged supporting bracket 6 is a column bracket structure, which is welded to the bottom of the sampling cabin 1. The base seat 8 is a truncated cone structure as a whole, and the bottom is wider, which increases the ground contact area of ​​the base seat 8 and improves the stability of the device. The wider bottom can also prevent the base seat 8 from sinking too deep into the seabed sediment.

[0064] In a further embodiment, a telescopic rod is further included, and the bottom of the supporting bracket is connected to the base seat 8 through the telescopic rod. The sensor is arranged between the telescopic rod and the bottom of the supporting bracket to detect the extension degree of the telescopic rod. When the sensor is triggered, it indicates that the base seat 8 has successfully bottomed out.

[0065] In a specific embodiment, the telescopic rod is a 4-legged telescopic rod 7 .

[0066] In a specific embodiment, the deep-sea sediment sampling device of the embodiment of the present invention has different control processes for different operation stages. In the near-bottom water layer, the device provides buoyancy through the propeller 2 and the buffer wing 5, reduces the descent speed of the sampling cabin 1 and finally keeps it hovering, and controls the buoyancy by adjusting the rotation speed of the propeller 2 to adjust the horizontal posture of the device; in the water layer closer to the bottom, after the sampling cabin 1 hovers stably, the propeller 2 is turned off, and the device is slowly lowered until the 4-foot telescopic rod 7 and the bottom base 8 contact the seabed sediment, so as to achieve a stable, low-disturbance soft landing operation of the device on the seabed, and the buffer wing 5 is retracted; the horizontal bottom posture of the device is adjusted by the 4-foot telescopic rod 7, and the sampling height is synchronously raised and lowered to assist in the precise deep sediment sampling operation of complex seabed terrain.

[0067] Example 3

[0068] This embodiment provides a control method for a deep-sea sediment sampling device, such as Figure 4 The control method is applied to the deep-sea sediment sampling device described in Example 1 or Example 2, and the control method comprises the following steps:

[0069] The sampling cabin 1 is connected to the ship base and lowered into the sea by a rope, and the sampling cabin 1 begins to sink;

[0070] When the altimeter 12 detects that the sampling cabin 1 descends to the near-bottom depth M1, the control device 11 starts the buoyancy buffer module to provide buoyancy;

[0071] The control device 11 sets the buoyancy provided by the buoyancy buffer module according to the sinking speed of the sampling cabin 1 and the horizontal posture of the sampling cabin 1 monitored by the electronic level 13, so that the sampling cabin 1 sinks in a horizontal posture;

[0072] When the sampling cabin 1 sinks in a horizontal posture, the buoyancy provided by the buoyancy buffer module is gradually reduced until it reaches 0;

[0073] The sampling cabin 1 is buffered and descends until the bottom seating module is seated.

[0074] In a further embodiment, the control device 11 activates the buoyancy buffer module to provide buoyancy, including:

[0075] The control device 11 starts the plurality of propellers 2 and unfolds the buffer wing 5 to a maximum unfolding area.

[0076] In a specific embodiment, the rotation speeds of the plurality of propellers 2 are respectively set so that the sampling cabin 1 sinks in a horizontal posture, such as Figure 5 As shown, including:

[0077] During the launching process, the horizontal posture of the sampling cabin 1 is in a three-axis tilted state. First, the horizontal posture of the device is monitored according to the electronic level 13, and the rotation speed of the two propellers 2 on the side with the highest tilt angle in the longitudinal axis of the device is taken as the reference datum X1, and the rotation speed of the other two propellers 2 is increased and synchronized to X2 (X2>X1) to make them at the same level as the longitudinal axis of the device, and then the rotation speed of the propeller 2 is controlled to X1 to provide consistent buoyancy; at this time, the horizontal posture of the device is in a tilted state of the horizontal axis, and the two propellers 2 on the side with the highest tilt angle of the horizontal axis indicated by the horizontal electronic instrument are used as the reference datum, and the rotation speed of the other two propellers 2 is increased to X2 (X2>X1) to provide buoyancy to adjust the tilt angle of the horizontal axis to a horizontal state, and then the rotation speed of the propeller 2 is controlled to X1 to provide consistent buoyancy, thus completing the horizontal posture adjustment of the device.

[0078] In a further embodiment, unfolding the buffer wing panel 5 to a maximum unfolding area comprises:

[0079] The wing telescopic rod 4 is activated to unfold the buffer wing 5 to the maximum unfolding area, that is, perpendicular to the side of the device, to further buffer the descending speed of the device.

[0080] In a further embodiment, the bottom-seating module is bottom-seated, further comprising the following steps:

[0081] Before the base seat 8 is seated, the telescopic rod maintains the maximum length. When the base seat 8 is seated, the sensor receives whether the telescopic rod rebounds to indicate whether the base seat 8 is seated successfully.

[0082] After the base seat 8 is successfully seated, the buffer wing plate 5 is folded up;

[0083] The control device 11 adjusts the extension amount of the telescopic rod according to the horizontal posture of the sampling cabin 1 monitored by the electronic level 13 until the sampling cabin 1 reaches a horizontal posture.

[0084] In a specific embodiment, due to the diverse terrain of the seabed, the horizontal posture of the device is usually in a three-axis tilt state, and the extension amount of the four-leg telescopic rod 7 needs to be adjusted respectively until the sampling chamber 1 reaches a horizontal posture, such as Figure 6 As shown, including:

[0085] First, the horizontal posture of the device is monitored by the electronic level 13, and the two telescopic feet on the side of the highest inclination angle of the longitudinal axis of the 4-legged telescopic rod 7 are taken as reference datum, and the other two telescopic feet are raised and synchronized to be at the same level as the telescopic feet of the reference datum; at this time, the horizontal posture of the device is in an inclined state of the horizontal axis, and the two telescopic feet on the side of the highest inclination angle of the horizontal axis indicated by the horizontal electronic instrument are used as reference datum, and the other two telescopic feet are raised and synchronized to be at the same level as the telescopic feet of the reference datum, thus completing the horizontal posture adjustment of the device.

[0086] According to the altimeter at the bottom of the device, indicating the distance between the sampler and the seabed surface sediment, the 4-foot telescopic rod 7 is adjusted synchronously to keep the device in a horizontal state and rise and fall to the required sediment sampling height to assist the sediment sampler in completing the sampling operation and realize the precise deep sediment sampling operation in complex seabed terrain. After the sampling is completed, the device is pulled up and recovered by the ship-based cable. When the device leaves the bottom, the 4-foot telescopic rod 7 is reset to the shortest length to facilitate the lifting and recovery of the device to the deck.

[0087] The embodiment of the present invention uses the propeller 2, the 4-leg telescopic rod 7 and the base platform to enable the sampling cabin 1 to perform low-disturbance bottom-seating operations in deep sea water layers and seabed sediments, avoiding destructive distortion of the in-situ environment caused by the device sitting hard on the bottom. At the same time, the 4-leg telescopic rod 7 is used to achieve horizontal posture control of the device after it is stably seated on the bottom, avoiding the risk of rollover of the device due to center of gravity shift during sampling operations.

[0088] The embodiment of the present invention can meet the requirements of accurate depth sampling operations under complex seabed sediment terrain through the horizontal posture control of the 4-leg telescopic rod 7, improves the sediment sampling accuracy, and avoids the problem of shallow sediment sampling depth and high sampling difficulty caused by sampling operations of the device in a non-horizontal posture.

[0089] The same or similar reference numerals correspond to the same or similar components;

[0090] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0091] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A deep-sea sediment sampling device, characterized in that: It includes a sampling cabin, a buoyancy buffer module and a bottom sitting module, among which: An electronic level and a control device are provided in the sampling cabin, and an altimeter is installed at the bottom of the sampling cabin; The buoyancy buffer module is installed around the sampling cabin, the bottom seating module is installed at the bottom of the sampling cabin, a sensor is installed at the bottom of the bottom seating module, the signal output ends of the electronic level, altimeter and sensor are connected to the signal input end of the control device, and the signal output end of the control device is connected to the control end of the buoyancy buffer module and the bottom seating module.

2. The deep-sea sediment sampling device according to claim 1, characterized in that: The buoyancy buffer module includes a plurality of propellers, a plurality of buffer wing plates and a plurality of propeller thrust compartments corresponding to the plurality of propellers one by one. The plurality of propeller thrust compartments are symmetrically arranged in the sampling cabin, the plurality of propellers are respectively installed in the corresponding propeller thrust compartments, the plurality of buffer wing plates are respectively symmetrically arranged on the outer wall of the sampling cabin, and the rotation speed of the plurality of propellers is controlled by the control device.

3. The deep-sea sediment sampling device according to claim 2, characterized in that: The buoyancy buffer module also includes a wing plate telescopic rod and a waterproof and pressure-resistant groove. The wing plate telescopic rod is installed in the waterproof and pressure-resistant groove and fixedly connected to the buffer wing plate. The telescopic movement of the wing plate telescopic rod is controlled by the control device.

4. The deep-sea sediment sampling device according to claim 3, characterized in that: The opening direction of the waterproof and pressure-resistant groove is at a preset angle.

5. The deep-sea sediment sampling device according to claim 1, characterized in that: The base module includes a supporting bracket and a base seat. The supporting bracket is fixed to the bottom of the sampling cabin, and the base seat is arranged at the bottom of the supporting bracket.

6. The deep-sea sediment sampling device according to claim 5, characterized in that: The base module also includes a telescopic rod, and the bottom of the support bracket is connected to the base seat through the telescopic rod. The sensor is arranged between the telescopic rod and the bottom of the support bracket to detect the extension degree of the telescopic rod.

7. A control method for a deep-sea sediment sampling device, characterized in that: The control method is applied to the deep-sea sediment sampling device according to any one of claims 1 to 6, and the control method comprises the following steps: The sampling cabin is connected to the ship base and the rope is lowered into the sea, and the sampling cabin begins to sink; When the altimeter detects that the sampling cabin descends to the near-bottom depth M1, the control device starts the buoyancy buffer module to provide buoyancy; The control device sets the size of the buoyancy provided by the buoyancy buffer module according to the sinking speed of the sampling cabin and the horizontal posture of the sampling cabin monitored by the electronic level, so that the sampling cabin sinks in a horizontal posture; When the sampling cabin sinks in a horizontal posture, the buoyancy provided by the buoyancy buffer module is gradually reduced until it reaches 0; The sampling cabin is buffered and descends until the bottom seating module is seated.

8. The control method of the deep-sea sediment sampling device according to claim 7, characterized in that: The control device starts the buoyancy buffer module to provide buoyancy, including: The control device starts the plurality of propellers and unfolds the buffer wing to a maximum unfolding area.

9. The control method of the deep-sea sediment sampling device according to claim 8, characterized in that: Expanding the buffer wing to a maximum expansion area includes: The control device activates the wing panel telescopic rod to unfold the buffer wing panel to a maximum unfolding area.

10. The control method of the deep-sea sediment sampling device according to claim 9, characterized in that: Setting the buoyancy provided by the buoyancy buffer module so that the sampling cabin sinks in a horizontal posture includes: The horizontal posture of the sampling cabin during the sinking process is in a three-axis tilt state. First, the horizontal posture of the sampling cabin is monitored according to the electronic level. The propeller speed on the side with the highest tilt angle in the longitudinal axis of the sampling cabin is used as the reference datum X1, and the speed of the other propeller is increased and synchronized to X2, X2>X1, so that the longitudinal axis of the sampling cabin is at the same level, and then the propeller speed is controlled to X1 to provide consistent buoyancy; at this time, the horizontal posture of the sampling cabin is in a tilted state of the transverse axis. The propeller on the side with the highest tilt angle of the transverse axis indicated by the horizontal electronic instrument is used as the reference datum X1, and the speed of the other propeller is increased to X2, X2>X1 to provide buoyancy to adjust the tilt angle of the transverse axis to a horizontal state, and then the propeller speed is controlled to X1 to provide consistent buoyancy, thereby completing the horizontal posture adjustment of the sampling cabin.

11. The control method of the deep-sea sediment sampling device according to any one of claims 7 to 10, characterized in that: The bottom-sitting module is bottom-sitting, and further comprises the following steps: Before the base seat is seated, the telescopic rod maintains the maximum length. When the base seat is seated, the sensor receives whether the telescopic rod rebounds to indicate whether the base seat is seated successfully. After the base seat is successfully seated, the buffer wing plate is retracted; The control device adjusts the extension amount of the telescopic rod according to the horizontal posture of the sampling cabin monitored by the electronic level until the sampling cabin reaches a horizontal posture.

12. The control method of the deep-sea sediment sampling device according to claim 11, characterized in that: Adjusting the extension amount of the telescopic rod until the sampling cabin reaches a horizontal posture comprises: The horizontal posture of the sampling cabin is monitored by an electronic level, and the two telescopic feet on the side of the highest inclination angle of the longitudinal axis of the telescopic rod are used as reference datums. The other two telescopic feet are raised and synchronized to be at the same level as the telescopic feet of the reference datum. At this time, the horizontal posture of the device is in an inclined state of the horizontal axis. The two telescopic feet on the side of the highest inclination angle of the horizontal axis indicated by the horizontal electronic instrument are used as reference datums. The other two telescopic feet are raised and synchronized to be at the same level as the telescopic feet of the reference datum, thereby completing the horizontal posture adjustment of the device.

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