A deep-sea unpowered autonomous buried bottom-sitting device and method of operation

Abstract

A deep-sea, unpowered, autonomous burial device and its operating method include a burial rod with an internal cylindrical flow channel and four axially symmetrical horizontal flow channels connected to the cylindrical flow channel around its perimeter. A limiting boss assembly is installed externally on the burial rod, consisting of an upper and lower limiting boss arranged at an interval. A piston assembly is installed inside the cylindrical flow channel. A sliding assembly is fitted onto the burial rod between the upper and lower limiting bosses, and a rotating assembly is installed externally on the sliding assembly. The device uses the force of ocean currents absorbed by a propeller as power input. Through the adaptive deformation of the propeller blades, the propeller repeatedly rises and falls. Combined with the design of the piston, one-way valve, and internal flow channels of the support rod, it achieves intermittent suction of seabed silt at the bottom of the support rod, gradually inserting the support rod into the seabed until complete burial.

Description

Technical Field

[0001] This invention relates to the field of deep-sea operation equipment technology, and in particular to a deep-sea unpowered autonomous burial device and its operation method. Background Technology

[0002] In deep-sea construction operations, it is necessary to deploy the equipment on the seabed. Due to varying seabed geology, to avoid localized sinking, the main body of the equipment needs to be supported by a bottom-mounted support rod inserted into the seabed, and it needs to have a certain height. After the operation is completed, the long support rods are easily visible and can easily be detected, compromising concealment. Therefore, the equipment needs to be removed. Since the equipment is deployed on the deep seabed, current technologies can only use deep-sea submersibles for close-range recovery or on-site burial. Using a deep-sea submersible to remove multiple equipment nodes over a large area is neither economical nor easy to expose the operation site. Therefore, the bottom-mounted device needs to be able to automatically bury itself after the mission is completed. In addition, to achieve batch deployment and networking, the device needs to be adaptable to any sea depth and have a simple structure and low cost. To save energy and improve reliability during long-term bottom-mounting, the device cannot be equipped with expensive deep-sea pressure-resistant power sources and drive mechanisms. Considering the above requirements, no relevant solutions have been found yet, and there is an urgent need for a deep-sea, unpowered, autonomous bottom-mounted device and its operation method. Summary of the Invention

[0003] To address the shortcomings of existing production technologies, the applicant provides a deep-sea unpowered autonomous burial device and operating method. This device uses the propeller to absorb ocean current force as power input and maintains repeated lifting and lowering of the propeller through the adaptive deformation of the propeller blades. Combined with the design of pistons, one-way valves, and internal flow channels in the support rod, it enables intermittent suction of seabed silt at the bottom of the support rod, promoting the gradual insertion of the node support rod into the seabed until complete burial.

[0004] The technical solution adopted in this invention is as follows:

[0005] A deep-sea autonomous burial device without power includes a burial rod. The burial rod has an internal cylindrical flow channel coaxial with itself, passing through the bottom and closed at the top. Four axially symmetrical horizontal flow channels are arranged around the top of the burial rod, communicating with the cylindrical flow channels. A limiting boss assembly is installed externally on the burial rod, consisting of an upper limiting boss and a lower limiting boss, arranged vertically and horizontally at intervals. A piston assembly is installed inside the cylindrical flow channels. A sliding assembly is fitted onto the burial rod between the upper and lower limiting bosses, and a rotating assembly is installed externally on the sliding assembly.

[0006] Its further technical solution lies in:

[0007] The base rod is a slender rod with a semi-ellipsoidal protrusion at the bottom.

[0008] The base rod is made of aluminum alloy.

[0009] The piston assembly has the following structure: it includes a piston disc with a one-way valve in the middle. The piston disc is installed inside the cylindrical flow channel and is made of iron-based material, which attracts the sliding component.

[0010] The upper limit boss and the lower limit boss have the same structure.

[0011] The lower limit boss includes a lower boss and a lower limit plate. The lower limit boss is coaxially installed with the base rod and fixed on the base rod. The lower boss is a semi-ellipsoid and the bottom of the lower boss is fixedly connected to the lower limit plate.

[0012] The sliding assembly consists of a support ring, a quick-acting disc, and a sliding bushing. The support ring is a cylindrical thin-shell structure, coaxially mounted with the base rod. It has four arc-shaped limiting holes, symmetrical about the axis of the support ring. The sliding bushing is a circular ring with internal ball bearings, fitted onto the base rod and coaxially mounted with it. The sliding bushing can slide up and down and contains a strong magnet, providing sufficient magnetic attraction to the piston assembly for synchronous up-and-down movement. The quick-acting disc is a deformable circular thin-shell structure, fixed in the center to the sliding bushing and around the inner wall of the support ring.

[0013] The rotating assembly consists of a rotating shaft, a torsion spring, a blade, and a limiting rod. The rotating shaft is connected to the middle of the support ring, perpendicular to the axis of the support ring, and can rotate. The other side of the rotating shaft is fixed to the middle of the blade. One end of the torsion spring is connected to the support ring, and the other end is fixed to the blade. The torsion spring has an initial torque. When there is no actuating disc to obstruct the rotation of the limiting rod, the torsion spring will cause the blade to rotate clockwise, resulting in the blade presenting a negative angle of attack with the front facing down.

[0014] One end of the limiting rod is fixed to the bottom of the blade and parallel to the blade guide edge, while the other end of the limiting rod passes through the arc-shaped limiting hole on the support ring and enters the support ring.

[0015] The blades, limit rods, rotating shafts, and torsion springs are rigidly connected to form a rotating assembly, and four sets are provided in total, which are symmetrical about the axis of the support ring.

[0016] An operation method for a deep-sea, unpowered, autonomous burial device includes the following steps:

[0017] Unpowered descent process:

[0018] The seabed geology was measured by the geological profiling instruments carried by the mother ship to determine a suitable location for diving and bottoming operations.

[0019] Before the bottoming device is dropped from the mother ship, push the emergency stop plate to the concave position. Under the action of the torsion spring, the propeller blade rotates clockwise, and the limit rod rotates to the bottom of the arc-shaped limit hole. At this time, the torsion spring still has a certain torque to lock the limit rod. At this time, the propeller blade is in a negative angle of attack state with the right lower and the left higher.

[0020] Once the bottom-sitting device is jettisoned, it will descend without power due to its own negative buoyancy.

[0021] As the diving speed increases, the vertical water flow force propels the propeller blades, carrying the sliding assembly, to the upper limit boss. During the diving process, the sliding assembly remains above the bottoming device, acting as a tail stabilizer, which facilitates maintaining a vertical diving position and inserting into the seabed sediment.

[0022] Bottoming process:

[0023] When the device hits the bottom, the lower part of the bottom rod will insert into the seabed mud and sand;

[0024] After the base rod stops, the sliding component slides down relative to the bottom under its own momentum and impacts the lower limiting protrusion.

[0025] The lower limiting boss impacts the rapidly moving plate, causing it to deform upwards and form an upward convex state.

[0026] During the upward movement of the rapid-acting disc, the limiting rod is pushed upward until it rotates above the limiting hole and then stops. At this time, the rapid-acting disc still exerts a squeezing force on the limiting rod, thereby locking the limiting rod.

[0027] As the limit rod moves upward, it drives the blades and the rotating shaft to rotate clockwise, and the blades present a positive angle of attack state with the right side higher and the left side lower.

[0028] The process of bottom-mounted silt extraction:

[0029] After the base rod is inserted into the seabed, the ocean current will drive the propeller blade to rotate. Since the propeller blade is at a positive angle of attack, it generates lift, which drives the entire sliding assembly to move upward at an accelerated speed. The sliding ring in the sliding assembly has a magnetic attraction to the piston inside the base rod, which drives it to move upward together. During the upward movement of the piston assembly, the pressure above is greater than the pressure below, the one-way valve closes, and the piston assembly forms a suction effect on the internal flow channel of the base rod. The water mixed with mud and sand at the bottom of the base rod is drawn into the axial flow channel below the piston assembly.

[0030] When the sliding component moves upward and collides with the upper limit boss, the impact causes the quick-acting disc to deform into a concave state. Without the restriction of the quick-acting disc, the torsion spring drives the blade to rotate clockwise until the limit rod rotates to the bottom of the limit hole and stops. At this time, the torsion spring still has torque, which locks the limit rod and turns the blade into a negative angle of attack state.

[0031] The ocean current causes the propeller blades at a negative angle of attack to rotate and generate a downward force, which drives the sliding assembly to move downward at an accelerated speed. The sliding ring drives the piston assembly downward through magnetic force, causing the pressure below the one-way valve to be greater than the pressure above it, thus causing the valve to open. Water containing silt below the piston disc will enter the axial flow channel above the piston disc through the valve.

[0032] As the sliding component continues to move downwards until it collides with the lower limit boss, the blade switches back to the positive angle of attack state. During the upward movement of the sliding component, it will drive the piston component to move upwards. Since the valve is closed at this time, the water with mud and sand above will be sprayed out from the four horizontal nozzles above through the axial flow channel and the horizontal flow channel.

[0033] Through multiple automatic reciprocating cycles, the sliding component repeatedly taps and shakes the bottom support pole, while intermittently suctioning seawater from the bottom of the bottom support pole, carrying mud and sand out, causing the bottom support pole to gradually insert into the seabed; ultimately, this reduces the height of the bottom support pole, achieving automatic burial.

[0034] The beneficial effects of this invention are as follows:

[0035] This invention features a compact and rational structure and is easy to operate. Through the coordinated operation of the base rod, piston assembly, limiting boss assembly, sliding assembly, and rotating assembly, the entire process of autonomous burial can be easily completed. The propeller absorbs the force of ocean currents as the power input, and the propeller maintains repeated lifting and lowering through the adaptive deformation of the blades. Combined with the design of the piston, one-way valve, and internal flow channel of the support rod, the intermittent suction operation of seabed silt at the bottom of the support rod is realized, which promotes the gradual insertion of the node support rod into the seabed until it is completely buried.

[0036] This invention requires no energy source or electric drive mechanism, has a simple structure, low cost, and is applicable to all ocean depths, meeting the needs of large-scale deployment and networking, and providing a new device and method for deep-sea special operations. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention.

[0038] Figure 2 This is the front view of the present invention.

[0039] Figure 3 This is a schematic diagram of the internal structure of the present invention (sliding components and rotating components are omitted).

[0040] Figure 4 for Figure 3 A magnified view of part A in the middle.

[0041] Figure 5 for Figure 3 A magnified view of part B in the middle.

[0042] Figure 6This is a schematic diagram of the installation of the sliding component and the rotating component of the present invention.

[0043] Figure 7 for Figure 6 A magnified view of part C in the middle.

[0044] Figure 8 This is a schematic diagram of the sliding component of the present invention.

[0045] Figure 9 This is a half-sectional schematic diagram of the sliding component of the present invention.

[0046] Figure 10 This is a schematic diagram of the structure of the propeller blade under the positive power angle state of the present invention.

[0047] Figure 11 This is a schematic diagram of the structure of the propeller blade under negative power angle conditions according to the present invention.

[0048] The components include: 1. base rod; 2. piston assembly; 3. limiting boss assembly; 4. sliding assembly; 5. rotating assembly;

[0049] 11. Axial flow channel; 12. Horizontal flow channel;

[0050] 21. Piston disc; 22. Check valve;

[0051] 31. Upper limit boss; 32. Lower limit boss;

[0052] 311. Upper boss; 312. Upper limit switch;

[0053] 321. Lower boss; 322. Lower limit plate;

[0054] 41. Support ring; 42. Activated disc; 43. Sliding bushing;

[0055] 411. Arc-shaped limiting hole;

[0056] 51. Rotating shaft; 52. Torsion spring; 53. Blade; 54. Limiting rod. Detailed Implementation

[0057] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0058] like Figures 1-11As shown, the deep-sea unpowered autonomous burial device of this embodiment includes a base rod 1. The base rod 1 has a cylindrical flow channel coaxial with itself inside, which passes through the bottom of the base rod 1 and is closed at the top. Four axially symmetrical horizontal flow channels 12 are arranged around the base rod 1 above it, and the horizontal flow channels 12 are connected to the cylindrical flow channels. A limiting boss assembly 3 is installed on the outside of the base rod 1. The limiting boss assembly 3 is divided into an upper limiting boss 31 and a lower limiting boss 32. The upper limiting boss 31 and the lower limiting boss 32 are arranged opposite each other with a vertical gap. A piston assembly 2 is installed inside the cylindrical flow channel. A sliding assembly 4 is installed on the base rod 1 between the upper limiting boss 31 and the lower limiting boss 32. A rotating assembly 5 is installed on the outside of the sliding assembly 4.

[0059] The base rod 1 is a slender rod, and a semi-ellipsoidal protrusion is provided at the bottom of the base rod 1.

[0060] The base bar 1 is made of aluminum alloy.

[0061] The piston assembly 2 has the following structure: it includes a piston disc 21 with a one-way valve 22 in the middle. The piston disc 21 is installed inside the cylindrical flow channel and is made of iron-based material, which attracts the sliding assembly 4.

[0062] The upper limit boss 31 and the lower limit boss 32 have the same structure.

[0063] The lower limit boss 32 includes a lower boss 321 and a lower limit plate 322. The lower limit boss 32 is coaxially installed with the base rod 1 and fixed on the base rod 1. The lower boss 321 is a semi-ellipsoid and the bottom of the lower boss 321 is fixedly connected to the lower limit plate 322.

[0064] The sliding assembly 4 has the following structure: it includes a support ring 41, a sudden movement disc 42, and a sliding bushing 43. The support ring 41 is a cylindrical thin shell structure and is coaxially arranged with the base rod 1. The support ring 41 has four arc-shaped limiting holes 411, which are symmetrical about the axis of the support ring 41. The sliding bushing 43 is a ring structure with balls inside, which is fitted on the base rod 1 and coaxially arranged with the base rod 1. The sliding bushing 43 can slide up and down. The sliding bushing 43 has a strong magnet, which has sufficient magnetic attraction to the piston assembly 2 to achieve synchronous up and down movement. The sudden movement disc 42 is a deformable ring thin shell structure, which is fixed to the sliding bushing 43 in the middle and fixed to the inner wall of the support ring 41 on all four sides.

[0065] The rotating assembly 5 has the following structure: it includes a rotating shaft 51, a torsion spring 52, a blade 53, and a limiting rod 54. The rotating shaft 51 is connected to the middle of the support ring 41, perpendicular to the axis of the support ring 41, and can rotate. The other side of the rotating shaft 51 is fixed to the middle of the blade 53. One end of the torsion spring 52 is connected to the support ring 41, and the other end of the torsion spring 52 is fixed to the blade 53. The torsion spring 52 has an initial torque. When there is no abrupt disc 42 to obstruct the rotation of the limiting rod 54, the torsion spring 52 will cause the blade 53 to rotate clockwise, resulting in the blade 53 presenting a negative angle of attack with the front facing down.

[0066] One end of the limiting rod 54 is fixed to the bottom of the blade 53 and parallel to the guide edge of the blade 53. The other end of the limiting rod 54 passes through the arc-shaped limiting hole 411 on the support ring 41 and enters the support ring 41.

[0067] The blade 53, the limiting rod 54, the rotating shaft 51 and the torsion spring 52 are rigidly connected to form the rotating assembly 5, and a total of four sets are provided, which are symmetrical about the axis of the support ring 41.

[0068] The deep-sea unpowered autonomous burial device of the present invention mainly consists of a base rod 1, a piston assembly 2, a limiting boss assembly 3, a sliding assembly 4, and a rotating assembly 5.

[0069] The base rod 1 has a semi-ellipsoidal protrusion at the bottom, a cylinder at the top, a coaxial cylindrical flow channel inside, and an opening at the bottom. Four axisymmetric horizontal flow channels 12 are located around the top of the base rod 1, connecting to the internal cylindrical flow channel. The horizontal flow channels 12 are positioned above the upper limit boss 31. The base rod 1 is made of aluminum alloy and is not attracted by permanent magnets.

[0070] The piston assembly 2 consists of a piston disc 21 and a one-way valve 22, located inside a cylindrical water flow hole within the base rod 1. The piston disc 21 is made of iron-based material and is easily attracted by a sliding bushing 43 made of a strong permanent magnet, with the one-way valve 22 in the middle. When the pressure below the one-way valve 22 is greater than the pressure above it, the valve opens, allowing water to flow from below to above; when the pressure above it is greater than the pressure below it, the valve closes.

[0071] The limiting boss assembly 3 consists of an upper limiting boss 31 and a lower limiting boss 32. The lower limiting boss 32 consists of a lower boss 321 and a lower limiting plate 322, and is coaxial with the base rod 1 and fixed to the base rod 1. The lower boss 321 is a semi-ellipsoid, and its bottom is fixedly connected to the lower limiting plate 322. The upper surface of the lower boss 321 is conformal to the lower surface of the convex moving plate 42. The upper limiting boss 31 and the lower limiting boss 32 have the same shape, including the upper boss 311 and the upper limiting plate 312 with the same structure, and are only installed by flipping them upside down.

[0072] The sliding assembly 4 consists of a support ring 41, a moving disc 42, and a sliding bushing 43.

[0073] The support ring 41 is a thin-shell cylindrical structure, coaxial with the base rod 1. The support ring 41 has four arc-shaped limiting holes 411, which are symmetrical about the axis of the support ring 41. The width of the arc-shaped limiting holes 411 is slightly larger than the diameter of the limiting rod 54.

[0074] The sliding bushing 43 is a ring structure with internal balls, which is fitted onto the base rod 1 and coaxial with it, allowing it to slide up and down. The sliding bushing 43 has a strong magnet, which has sufficient magnetic attraction to the piston assembly 2, driving it to move up and down.

[0075] The actuating disc 42 is a deformable ring-shaped thin-shell structure, fixed in the middle to the sliding bushing 43 and fixed around the inner wall of the support ring 41. The actuating disc 42 has two forms: convex and concave, and switches between these two states when pushed by an external force.

[0076] The rotating assembly 5 consists of a rotating shaft 51, a torsion spring 52, a blade 53, and a limiting rod 54.

[0077] The rotating shaft 51 is connected to the middle of the support ring 41, perpendicular to the axis of the support ring 41, and can rotate. The other side of the rotating shaft 51 is fixed to the middle of the blade 53.

[0078] One end of the torsion spring 52 is connected to the support ring 41, and the other end is fixed to the blade 53. The torsion spring 52 has an initial torque. When there is no actuating disc 42 to obstruct the rotation of the limiting rod 54, the torsion spring 52 will cause the blade 53 to rotate clockwise, resulting in the blade 53 presenting a negative angle of attack with the front facing down.

[0079] The blade 53 has a rectangular thin-plate structure.

[0080] One end of the limiting rod 54 is fixed to the bottom of the blade 53 and parallel to the guide edge of the blade 53, while the other end passes through the limiting hole on the support ring 41 and enters the support ring 41.

[0081] The blade 53, the limiting rod 54, the rotating shaft 51 and the torsion spring 52 are rigidly connected to form the rotating assembly 5, which consists of four sets and is symmetrical about the axis of the support ring 41.

[0082] In actual work process:

[0083] (I) Unpowered descent process:

[0084] The seabed geology was measured using geological profiling instruments carried by the mother ship to determine suitable locations for diving and bottoming operations.

[0085] Before the landing gear is jettisoned from the mother ship, the emergency stop disc 42 is pushed into a concave position. Under the action of the torsion spring 52, the propeller blade 53 rotates clockwise, and the limiting rod 54 rotates to below the arc-shaped limiting hole 411. At this time, the torsion spring 52 still has a certain torque, thus locking the limiting rod 54. At this time, the propeller blade 53 is in a negative angle of attack state with the right side lower and the left side higher.

[0086] Once the bottom-sitting device is jettisoned, it descends without power due to its own negative buoyancy.

[0087] As the descent speed increases, the vertical water flow force propels the propeller 53, carrying the sliding assembly 4, to the upper limit boss 31. During descent, the sliding assembly 4 remains above the bottom-sitting device, acting as a tail stabilizer to facilitate vertical descent and insertion into the seabed sediment.

[0088] (II) Bottoming Process:

[0089] When the device impacts the bottom at a certain speed, the lower part of the bottom rod 1 will insert into the seabed mud and sand.

[0090] After the base rod 1 stops, the sliding component 4 slides down relative to the bottom under its own momentum and hits the limiting protrusion below.

[0091] The lower limiting boss impacts the rapid moving plate 42, causing it to deform upwards and form an upward convex state.

[0092] During the upward movement of the rapid-acting disc 42, the limiting rod 54 is pushed upward until it rotates above the limiting hole and then stops. At this time, the rapid-acting disc 42 still exerts a squeezing force on the limiting rod 54, thereby locking the limiting rod 54.

[0093] As the limit rod 54 moves upward, it drives the blade 53 and the rotating shaft 51 to rotate clockwise, and the blade 53 presents a positive angle of attack state with the right side higher and the left side lower.

[0094] (III) The process of bottom-mounted silt extraction:

[0095] After the base rod 1 is inserted into the seabed, the ocean current will drive the propeller blade 53 to rotate. Because the propeller blade 53 is at a positive angle of attack, it generates lift, causing the entire sliding assembly 4 to accelerate upwards. The sliding ring in the sliding assembly 4 has a magnetic attraction to the piston inside the base rod, causing it to move upwards as well. During the upward movement of the piston assembly 2, the pressure above is greater than the pressure below, the one-way valve 22 closes, and the piston assembly 2 creates a suction effect on the internal flow channel of the base rod. Water mixed with sediment at the bottom of the base rod is drawn into the axial flow channel 11 below the piston assembly 2.

[0096] When the sliding component 4 moves upward and collides with the upper limit boss 31, the impact causes the actuating disc 42 to deform into a concave state. Without the restriction of the actuating disc 42, the torsion spring 52 drives the blade 53 to rotate clockwise until the limiting rod 54 rotates below the limiting hole and stops. At this time, the torsion spring 52 still has torque, which locks the limiting rod 54 and turns the blade 53 into a negative angle of attack state.

[0097] The ocean current causes the propeller blade 53, operating at a negative angle of attack, to rotate and generate a downward force, which accelerates the sliding assembly 4 downwards. The sliding ring, through magnetic force, moves the piston assembly 2 downwards, causing the pressure below the one-way valve 22 to be greater than the pressure above it, thus opening the valve. Water containing sediment below the piston disc 21 enters the axial flow channel 11 above the piston disc 21 through the valve.

[0098] The sliding component 4 continues to move downwards until it collides with the lower limit boss 32, and the blade 53 switches back to the positive angle of attack state. During the upward movement of the sliding component 4, it will drive the piston component 2 to move upwards. Since the valve is closed at this time, the water with mud and sand above will be sprayed out from the four horizontal nozzles above through the axial flow channel 11 and the horizontal flow channel 12.

[0099] Through repeated automatic cycles, the sliding component 4 repeatedly taps and shakes the bottom support rod, while intermittently suctioning seawater from the bottom of the bottom support rod 1, carrying sediment out, gradually pushing the bottom support rod into the seabed. Ultimately, this reduces the height of the bottom support rod, achieving automatic burial.

[0100] This invention does not require energy sources, drive motors, or other mechanisms, and has a simple structure, low cost, and is easy to mass-produce.

[0101] This invention does not require consideration of deep-sea pressure resistance issues and can be applied to all ocean depths.

[0102] This invention requires no power source and utilizes ocean currents to achieve automatic reciprocating circulation, causing the bottom support pole 1 to insert into the seabed and achieve autonomous burial.

[0103] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A deep-sea, unpowered, autonomous burial device, characterized in that: The device includes a base rod (1), with a cylindrical flow channel coaxial with the base rod (1) inside and passing through the bottom of the base rod (1) and closed at the top; four axially symmetrical horizontal flow channels (12) are arranged around the base rod (1) above it, and the horizontal flow channels (12) are connected to the cylindrical flow channels; a limiting boss assembly (3) is installed on the outside of the base rod (1), the limiting boss assembly (3) is divided into an upper limiting boss (31) and a lower limiting boss (32), the upper limiting boss (31) and the lower limiting boss (32) are arranged opposite each other with a gap between them, a piston assembly (2) is installed inside the cylindrical flow channel, a sliding assembly (4) is installed on the base rod (1) between the upper limiting boss (31) and the lower limiting boss (32), and a rotating assembly (5) is installed on the outside of the sliding assembly (4); The structure of the sliding assembly (4) is as follows: it includes a support ring (41), a quick-acting disc (42), and a sliding bushing (43). The support ring (41) is a cylindrical thin shell structure. The support ring (41) is coaxially arranged with the base rod (1). The support ring (41) has four arc-shaped limiting holes (411). The arc-shaped limiting holes (411) are symmetrical about the axis of the support ring (41). The sliding bushing (43) is a circular ring structure with balls inside. It is fitted on the base rod (1) and coaxially arranged with the base rod (1). The sliding bushing (43) can slide up and down. The sliding bushing (43) has a strong magnet and has sufficient magnetic attraction force on the piston assembly (2) to achieve synchronous up and down movement. The quick-acting disc (42) is a deformable circular thin shell structure. It is fixed in the middle to the sliding bushing (43) and fixed around the inner wall of the support ring (41). The rotating assembly (5) has the following structure: including a rotating shaft (51), a torsion spring (52), a blade (53) and a limiting rod (54). The rotating shaft (51) is connected to the middle of the support ring (41), perpendicular to the axis of the support ring (41), and can rotate. The other side of the rotating shaft (51) is fixed to the middle of the blade (53). One end of the torsion spring (52) is connected to the support ring (41), and the other end of the torsion spring (52) is fixed to the blade (53). The torsion spring (52) has an initial torque. When there is no actuating disc (42) to obstruct the rotation of the limiting rod (54), the torsion spring (52) will cause the blade (53) to rotate clockwise, resulting in the blade (53) presenting a negative angle of attack with the front facing down. One end of the limiting rod (54) is fixed to the bottom of the blade (53) and parallel to the guide edge of the blade (53). The other end of the limiting rod (54) passes through the arc-shaped limiting hole (411) on the support ring (41) and enters the support ring (41).

2. The deep-sea unpowered autonomous burial device as described in claim 1, characterized in that: The base rod (1) is a slender rod, and a semi-ellipsoidal protrusion is provided at the bottom of the base rod (1).

3. The deep-sea unpowered autonomous burial device as described in claim 1, characterized in that: The base rod (1) is made of aluminum alloy.

4. The deep-sea unpowered autonomous burial device as described in claim 1, characterized in that: The piston assembly (2) has the following structure: it includes a piston disc (21), a one-way valve (22) in the middle of the piston disc (21), the piston disc (21) is installed in the cylindrical flow channel and is made of iron-based material, and attracts the sliding assembly (4).

5. The deep-sea unpowered autonomous burial device as described in claim 1, characterized in that: The upper limit boss (31) and the lower limit boss (32) have the same structure.

6. The deep-sea unpowered autonomous burial device as described in claim 1, characterized in that: The lower limit boss (32) includes a lower boss (321) and a lower limit plate (322). The lower limit boss (32) is coaxially installed with the base rod (1) and fixed on the base rod (1). The lower boss (321) is a semi-ellipsoid and the bottom of the lower boss (321) is fixedly connected to the lower limit plate (322).

7. The deep-sea unpowered autonomous burial device as described in claim 1, characterized in that: The blade (53), the limiting rod (54), the rotating shaft (51) and the torsion spring (52) are rigidly connected to form a rotating assembly (5), and a total of four sets are provided, which are symmetrical about the axis of the support ring (41).

8. A method for operating a deep-sea, unpowered, autonomous burial device as described in claim 1, characterized in that: The process includes the following: Unpowered descent process: The seabed geology was measured by the geological profiling instruments carried by the mother ship to determine a suitable location for diving and bottoming operations. Before the bottoming device is dropped from the mother ship, the emergency drive plate (42) is pushed to the concave state. Under the action of the torsion spring (52), the propeller (53) rotates clockwise, and the limit rod (54) rotates to the bottom of the arc-shaped limit hole (411). At this time, the torsion spring (52) still has a certain torque, which locks the limit rod (54). At this time, the propeller (53) is in a negative angle of attack state with the right lower and the left higher. Once the bottom-sitting device is jettisoned, it will descend without power due to its own negative buoyancy. As the diving speed increases, the vertical water flow force pushes the propeller (53) and the sliding component (4) to the upper limit boss (31); during the diving process, the sliding component (4) remains above the bottoming device, which acts as a tail stabilizer, making it easier to maintain a vertical diving state and insert into the seabed mud. Bottoming process: When the device hits the bottom, the bottom part of the bottom rod (1) will be inserted into the seabed mud and sand; After the bottom rod (1) stops, the sliding component (4) slides down relative to the bottom under its own momentum and hits the limiting protrusion below. The lower limiting boss impacts the rapid moving plate (42), causing it to deform upwards and form an upward convex state; During the upward movement of the rapid-acting disc (42), the limiting rod (54) is pushed upward until the limiting rod (54) rotates to the top of the limiting hole and then stops. At this time, the rapid-acting disc (42) still exerts a squeezing force on the limiting rod (54) to lock the limiting rod (54). During the upward movement of the limit rod (54), the blade (53) and the rotating shaft (51) are driven to rotate clockwise, and the blade (53) presents a positive angle of attack state with the right side higher and the left side lower. The process of bottom-mounted silt extraction: After the bottom rod (1) is inserted into the seabed, the ocean current will drive the blade (53) to rotate. Since the blade (53) is in a positive angle of attack state, it generates lift force, which drives the entire sliding assembly (4) to accelerate upward. The sliding ring in the sliding assembly (4) has a magnetic attraction force on the piston in the bottom rod (1), which drives it to move upward together. During the upward movement of the piston assembly (2), the pressure above is greater than the pressure below, the one-way valve (22) closes, and the piston assembly (2) forms a suction effect on the internal flow channel of the bottom rod (1). The water mixed with mud and sand at the bottom of the bottom rod (1) is drawn into the axial flow channel (11) below the piston assembly (2). When the sliding component (4) moves upward and collides with the upper limit boss (31), the impact causes the quick-acting disc (42) to deform into a concave state. Without the restriction of the quick-acting disc (42), the torsion spring (52) drives the blade (53) to rotate clockwise until the limit rod (54) rotates to the bottom of the limit hole and stops. At this time, the torsion spring (52) still has torque, which locks the limit rod (54) and turns the blade (53) into a negative angle of attack state. The ocean current causes the blade (53) at a negative angle of attack to rotate and generate a downward force, which drives the sliding assembly (4) to move downward at an accelerated speed. The sliding ring drives the piston assembly (2) downward through magnetic force, causing the pressure below the one-way valve (22) to be greater than the pressure above, which causes the valve to open. Water with mud and sand below the piston disc (21) will enter the axial flow channel (11) above the piston disc (21) through the valve. The sliding component (4) continues to move down until it collides with the lower limit boss (32). The blade (53) switches to the positive angle of attack state again. During the process of the sliding component (4) moving up again, it will drive the piston component (2) to move up. Since the valve is closed at this time, the water with mud and sand above will be sprayed out from the four horizontal nozzles above through the axial flow channel (11) and the horizontal flow channel (12). Through multiple automatic reciprocating cycles, the sliding component (4) repeatedly strikes and shakes the bottom rod (1), while intermittently sucking the seawater at the bottom of the bottom rod (1) and spraying out the mud and sand, causing the bottom rod (1) to gradually insert into the seabed; finally, the height of the bottom rod (1) is reduced, and automatic burial is achieved.

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