An underwater trencher based on vibration liquefaction

Abstract

The present invention discloses a seabed trencher based on vibration liquefaction, which includes a saturated sand liquefaction device and a suction device. The saturated sand liquefaction device includes a liquefaction tank and a wave-pushing plate. The liquefaction tank is a housing structure with a cavity formed inside, and a two-way flow part is formed on the housing, and the two-way flow part communicates with the cavity. The wave-pushing plate moves in the cavity, and a water flow path is formed between the wave-pushing plate and the cavity. The wave-pushing plate is used to push the water in the cavity to flow out from the two-way flow part. A one-way flow part is formed on the wave-pushing plate, and water can flow from the side of the cavity far from the two-way flow part to the side of the cavity close to the two-way flow part through the one-way flow part. The suction device includes a connecting pipeline and a driving pump, and the driving pump sucks sand from below the liquefaction tank through the connecting pipeline. The present invention provides a seabed trencher based on vibration liquefaction, which has a simple structure, accurate trenching range, and little disturbance to the surrounding water body.

Description

Technical Field

[0001] The present invention belongs to the technical field of subsea equipment, and specifically relates to a subsea trencher based on vibration liquefaction. Background Art

[0002] In order to protect subsea cables and pipelines from external damage and maintain their own stability, it is necessary to carry out subsea trenching to bury them to a reasonable depth. Currently, the technologies used for subsea trenching mainly include hydraulic trenching method, mechanical trenching method, and combined hydraulic and mechanical trenching method. The hydraulic trenching method uses a jet to spray and flush the seabed to create a trench; the mechanical trenching method is the most commonly used trenching method, and its principle is to use a chain saw, a turntable, or a plow blade, etc. to cut the seabed to form a trench, which is suitable for areas with large soil shear strength and hard soil quality, and the trenching speed is relatively fast.

[0003] With the maturity and development of technology, currently, the more advanced subsea trenchers based on vibration liquefaction all adopt a combination of mechanical and flushing methods, and mainly have the following deficiencies: the subsea trencher based on vibration liquefaction has poor soil-breaking effect, is difficult to trench accurately, and causes damage to the soil around the trench; it causes severe disturbance to the sea water, affects the survival of marine organisms, and has a limited range of applicable soil types, etc.

[0004] Therefore, researching and developing a subsea trencher based on vibration liquefaction with a simple structure, accurate trenching range, and small disturbance to the surrounding water body is a technical problem to be solved urgently. Summary of the Invention

[0005] In view of the problems pointed out in the background art, the present invention provides a subsea trencher based on vibration liquefaction, which has a simple structure, an accurate trenching range, and small disturbance to the surrounding water body.

[0006] To achieve the above-mentioned invention purpose, the present invention is implemented by adopting the following technical solutions:

[0007] A subsea trencher based on vibration liquefaction includes a saturated sand liquefaction device and a suction device. The saturated sand liquefaction device includes a liquefaction tank and a wave-pushing plate; the liquefaction tank is a shell structure with a cavity formed inside, a two-way flow part is formed on the shell, and the two-way flow part is communicated with the cavity; the wave-pushing plate moves in the cavity, and a water flow path is formed between the wave-pushing plate and the cavity; the wave-pushing plate is used to push the water in the cavity to flow out from the two-way flow part; a one-way flow part is formed on the wave-pushing plate, and water can flow from the side of the cavity far from the two-way flow part to the side of the cavity close to the two-way flow part through the one-way flow part; the suction device includes a connecting pipeline and a driving pump, and the driving pump sucks sand from below the liquefaction tank through the connecting pipeline.

[0008] In some embodiments of the present application, the unidirectional flow portion includes a plurality of flow holes formed in the pushing plate and a sealing cover plate. The sealing cover plate is hinged to the side of the flow hole close to the bidirectional flow portion, and the sealing cover plate opens and closes relative to the flow hole under the action of water flow.

[0009] In some embodiments of the present application, the bidirectional flow portion is a water-permeable membrane, and water flows into or out of the cavity through the water-permeable membrane.

[0010] In some embodiments of the present application, a first communication hole is formed in the side wall of the liquefaction tank, a second communication hole is formed in the pushing plate, and the communication pipeline sequentially passes through the first communication hole and the second communication hole and then extends out of the pushing plate.

[0011] In some embodiments of the present application, the saturated sand liquefaction device further includes a driving portion, and the driving portion drives the pushing plate to move in the cavity.

[0012] In some embodiments of the present application, the driving portion includes a motor and a lead screw assembly, and the motor drives the pushing plate to move relative to the bidirectional flow portion in the cavity through the lead screw assembly.

[0013] In some embodiments of the present application, the connecting portion includes a horizontal cross beam and a plurality of pushing columns. The horizontal cross beam is connected to the pushing plate through the plurality of pushing columns; the lead screw assembly includes a lead screw and a nut, the lead screw is connected to the nut; the nut is fixedly connected to the horizontal cross beam.

[0014] In some embodiments of the present application, it further includes a sealing shell, which is sleeved outside the driving portion, and the lower end of the sealing shell is hermetically connected to the liquefaction tank.

[0015] In some embodiments of the present application, a pushing column through hole is formed in the liquefaction tank, and the pushing column passes through the pushing column through hole and is connected to the pushing plate.

[0016] In some embodiments of the present application, a plurality of reinforcing ribs are formed in the liquefaction tank.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are:

[0018] The liquefaction tank has a housing structure with a cavity formed inside for accommodating water flow. A two-way circulation part for the water flow to enter and exit is formed at the bottom of the housing. The push plate moves inside the liquefaction tank to push the water flow out from the two-way circulation part. To reduce the resistance suffered by the push plate when it moves away from the two-way circulation part, a one-way circulation part is formed on the push plate. During the process of the push plate moving away from the two-way circulation part, in addition to flowing through the water circulation path, the water flow can also flow through the one-way circulation part, reducing the resistance suffered by the push plate and having a small resistance during the working process. The push plate reciprocates within the housing structure, and the push plate pushes the water flow to generate periodic vibrations inside the liquefaction tank. Such periodic vibrations can be stably maintained within the housing structure and can be transmitted to the surrounding seabed, causing the sandy soil of the surrounding seabed to liquefy. The liquefied saturated sandy soil is sucked through the suction device, thus realizing trenching and breaking the soil. Since the periodic vibrations occur inside the liquefaction tank, the impact on the surrounding seabed is relatively small. And because the method of trenching and breaking the soil by sucking the liquefied saturated sandy soil is adopted, the structure is simple and the trenching range is accurate.

[0019] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is a schematic diagram of the overall structure of a saturated sandy soil liquefaction device according to an embodiment of the present invention;

[0022] Figure 2 is Figure 1 the cross-sectional view in

[0023] Figure 3 is Figure 2 the partial enlarged view at A in

[0024] Figure 4 is a partial schematic diagram of a saturated sandy soil liquefaction device according to an embodiment of the present invention;

[0025] Figure 5 is a partial side view of a saturated sandy soil liquefaction device according to an embodiment of the present invention;

[0026] Figure 6 is a bottom view of a saturated sandy soil liquefaction device according to an embodiment of the present invention;

[0027] Figure 7Another partial schematic diagram of the saturated sand liquefaction device according to an embodiment of the present invention;

[0028] Figure 8 Overall structural schematic diagram of an embodiment of the present invention;

[0029] Figure 9 Side view of an embodiment of the present invention;

[0030] Figure 10 Cross-sectional view of an embodiment of the present invention

[0031] Reference numerals:

[0032] 100, liquefaction tank;

[0033] 110, cavity;

[0034] 120, two-way flow part;

[0035] 200, wave-pushing plate;

[0036] 210, flow hole;

[0037] 220, sealing cover plate;

[0038] 221, rotating shaft core;

[0039] 222, shaft core base;

[0040] 230, cover plate base;

[0041] 240, sealing rubber ring;

[0042] 300, driving part;

[0043] 310, motor;

[0044] 320, lead screw;

[0045] 330, coupling;

[0046] 340, sealing shell;

[0047] 341, reinforcing rib;

[0048] 342, dike corner;

[0049] 400, connecting part;

[0050] 410, horizontal cross beam;

[0051] 420, push column;

[0052] 500, suction device;

[0053] 510, including a communicating pipeline;

[0054] 520, drive pump. Specific embodiments

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0056] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0057] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0058] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0060] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0061] In this embodiment, a subsea trencher based on vibration liquefaction is involved, which uses a combination of mechanical trenching and hydraulic trenching to break the soil of the seabed.

[0062] Different from traditional hydraulic trenching, in this embodiment, as Figure 8 , Figure 9 , Figure 10 shown, a saturated sand liquefaction device is used to liquefy the sand of the seabed. After the saturated sand is liquefied, the seabed particles are in a completely suspended state; different from traditional mechanical trenching, a suction device 500 is provided, and the saturated sand is sucked away and removed by suction, so as to realize trenching of the seabed.

[0063] Using a saturated sand liquefaction device to liquefy the seabed, instead of the original method of jetting the seabed, can reduce the distance disturbance of seawater and avoid causing a greater impact on the survival of marine organisms.

[0064] Using the suction device 500 to suck the liquefied saturated sand, compared with the original method of cutting the seabed with a chain saw, a rotary disc or a plow blade, etc., the structure is simple and the trenching speed is also improved.

[0065] In this embodiment, a saturated sand liquefaction device that can be applied to a soil-breaking and trenching device is involved, which can output a large periodic load on the seabed, has a small vibration resistance during the working process, and can be applied to working conditions with a large amount of saturated sand liquefaction.

[0066] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown in the figure, the saturated sandy soil liquefaction device includes a liquefaction tank 100 and a wave-pushing plate 200. The liquefaction tank 100 is of a shell structure, and a cavity 110 is formed inside the shell structure. At the same time, a two-way flow part 120 is formed on the shell, and the two-way flow part 120 is communicated with the cavity 110. Water can flow into the cavity 110 through the two-way flow part 120, and the water in the cavity 110 can flow out of the liquefaction tank 100 through the two-way flow part 120.

[0067] In this embodiment, the size of the wave-pushing plate 200 is smaller than that of the cavity 110, and a water flow path is formed between the periphery of the wave-pushing plate 200 and the cavity 110.

[0068] Moreover, the two-way flow part 120 can ensure that only water can enter the liquefaction tank 100 through it, and sand and the like cannot pass through.

[0069] Specifically, the two-way flow part 120 can adopt a permeable membrane. Water can flow in and out of the cavity through the permeable membrane. At the same time, it can effectively prevent sediment from entering the liquefaction tank 100.

[0070] The wave-pushing plate 200 is placed in the liquefaction tank 100, and the wave-pushing plate 200 can move in the cavity 110 of the liquefaction tank 100. The wave-pushing plate 200 drives the water flow in the liquefaction tank 100 to flow.

[0071] Through the movement of the wave-pushing plate 200 in the cavity 110, the water in the cavity 110 is pushed to flow. The wave-pushing plate 200 makes a heaving motion in the cavity 110, so that the water in the liquefaction tank 100 generates periodic vibrations, and the seawater fluctuations act on the sandy soil seabed repeatedly, resulting in its liquefaction.

[0072] Due to the setting of the liquefaction tank 100, the heaving motion can be stably formed in the liquefaction tank 100 and will not be affected by the dispersion of the surrounding soil.

[0073] In this embodiment, the wave-pushing plate 200 moves in the liquefaction tank 100 from the side far away from the two-way flow part 120 to the side close to the two-way flow part 120, and pushes the water flow in the liquefaction tank 100 to flow out through the two-way flow part 120.

[0074] When the wave-pushing plate 200 moves from the side close to the two-way flow part 120 to the side far away from the two-way flow part 120, the water flows into the liquefaction tank 100 from the two-way flow part 120.

[0075] Such as Figure 6 、 Figure 7As shown, during the process that the wave - pushing plate 200 moves alternately back and forth in the liquefaction tank 100, close to and away from the two - way flow part 120, the periodic vibration of the water in the liquefaction tank 100 is realized. The periodic vibration of the water flow in the liquefaction tank 100 is output through the two - way flow part 120 and acts on the seabed. When the saturated sand on the seabed is subjected to periodic loads, there is a tendency for particles to move and become denser. At this time, the particles break away from the surrounding particles and suspend. The particle gravity and the external force on the soil mass all act on the pore water. However, the permeability of the saturated sand is low, and the pore water cannot be quickly discharged, resulting in a sharp rise in pore water pressure, causing the effective stress of the sand to drop to 0, and the seabed particles being in a completely suspended state, that is, soil liquefaction occurs. The seawater fluctuates cyclically and acts on the sandy seabed, resulting in its liquefaction, thereby reducing the trenching resistance during the operation of the subsea trencher based on vibration liquefaction in the later stage.

[0076] When the wave - pushing plate 200 moves towards the side of the two - way flow part 120 in the liquefaction tank 100, it can push the water in the liquefaction tank 100 to flow out from the two - way flow part. When the wave - pushing plate 200 moves towards the side away from the two - way flow part 120, the water flow enters the liquefaction tank 100. At this time, the wave - pushing plate 200 bears a large pressure.

[0077] In order to reduce the resistance suffered by the wave - pushing plate 200 and make it applicable to the treatment of a large amount of saturated sand on the seabed, a one - way flow part is formed on the wave - pushing plate 200. When the wave - pushing plate 200 moves away from the two - way flow part 120 in the liquefaction tank 100, the water flow can flow through the wave - pushing plate 200 through the one - way flow part, thereby reducing the resistance suffered by the wave - pushing plate 200 during the upward movement.

[0078] In this embodiment, the one - way flow part includes a number of flow holes 210 opened on the wave - pushing plate 200 and a sealing cover plate 220 that can open and close relative to the flow holes 210.

[0079] One side of the sealing cover plate 220 is hinged to the edge of the flow hole 210, and the sealing cover plate 220 is arranged on the side of the wave - pushing plate 200 close to the two - way flow part 120.

[0080] Regarding the number of the flow holes 210 and their opening positions on the wave - pushing plate 200, there is no limitation.

[0081] In this embodiment, the flow holes 210 are evenly spaced on the wave - pushing plate 200.

[0082] Specifically, a cover plate base 230 is also arranged at the edge of the flow hole 210, and the cover plate base 230 is arranged on the wave - pushing plate 200 around the flow hole 210.

[0083] After the sealing cover plate 220 is closed, it contacts the cover plate base 230.

[0084] Specifically, the sealing cover plate 220 can be made of rubber material, and a magnetic sheet is provided therein. Through the action of the magnetic sheet, the sealing cover plate 220 can be adsorbed on the cover plate base 230.

[0085] When the push plate 200 moves towards the two-way flow portion 120, the sealing cover plate 220 can be tightly attached to the cover plate base 230 under the action of suction force and water flow resistance, realizing the closing of the flow hole 210.

[0086] When the push plate 200 moves in the direction away from the two-way flow portion 120, it is opened due to the action of a large water flow force, thereby reducing the resistance acting on the push plate 200 during movement.

[0087] Specifically, a rotating shaft core 221 is connected to the edge of the sealing cover plate 220. An axis core base 222 is connected to the cover plate base 230. The axis core base 222 serves as the base of the rotating shaft core 221. A bearing is provided inside the axis core base 222, and the rotating shaft core 221 is rotatably connected to the axis core base 222 through the bearing inside it. The axis core base 222 can limit the relative rotation angle of the rotating shaft core 221, preventing the sealing cover plate 220 from opening too large an angle and being unable to return to its original position.

[0088] In this embodiment, in order to enable the push plate 200 to move inside the liquefaction tank 100, a driving portion 300 and a connecting portion 400 are further provided.

[0089] The driving portion 300 includes a motor 310, a lead screw assembly, and a coupling 330. The lead screw assembly includes a lead screw 320 and a nut.

[0090] The output end of the motor 310 is connected to the lead screw 320 through the coupling 330, driving the lead screw 320 to perform a rotational motion.

[0091] The connecting portion 400 includes a horizontal cross beam 410 and a plurality of push columns 420.

[0092] A plurality of push columns 420 are arranged at intervals on the horizontal cross beam 410. The other end of the push column 420 is connected to the push plate 200.

[0093] In order to realize the connection between the push column 420 and the push plate 200, push column through holes are opened at corresponding positions on the push plate 200, and the push column 420 is connected to the push plate 200 after passing through the push column through holes.

[0094] In order to ensure the sealing performance at the connection between the push column 420 and the push column through hole, a sealing rubber ring 240 is also provided here. The sealing rubber ring 240 can prevent the water inside the liquefaction tank 100 from overflowing from the connection between the push column 420 and the push column through hole.

[0095] In this embodiment, in order to ensure the sealing and waterproof performance of the driving part 300 and the connecting part 400, a sealing shell 340 is sleeved outside the driving part 300 and the connecting part 400. The sealing shell 340 is used to prevent the driving part 300 and the connecting part 400 from contacting seawater, so as to ensure the normal operation of the device.

[0096] The lower end of the sealing shell 340 is hermetically connected to the liquefaction tank 100.

[0097] Since the saturated sand liquefaction device is often used in underwater operations when applied to trench excavation and soil breaking operations, and the medium inside the sealing shell 340 is air, and the pressure difference between the inside and outside of the sealing shell 340 is relatively large, therefore, a plurality of reinforcing ribs 341 are provided inside the sealing shell 340.

[0098] In order to further enhance the connection strength between the sealing shell 340 and the liquefaction tank 100, dikes 342 are provided on both sides of the sealing shell 340 for reinforcement.

[0099] As Figure 8 、 Figure 9 、 Figure 10 shown, the suction device 500 includes a communication pipeline 510 and a driving pump 520. The driving pump 520 is used to provide power to the communication pipeline 510 to suck the saturated sand passing through the saturated sand liquefaction device.

[0100] In this embodiment, a first communication hole is opened on the side wall of the liquefaction tank 100, a second communication hole is opened on the push plate 200, the first end of the communication pipeline 510 is communicated with the driving pump 520, and the second end of the communication pipeline 510 sequentially passes through the first communication hole and the second communication hole and then extends outside the push plate 200.

[0101] The motor 310 drives the push plate 200 to perform heaving motion in the liquefaction tank 100 through the lead screw 320, so that the seawater in the liquefaction tank 100 generates periodic vibration. The seawater generates periodic vibration in the liquefaction tank 100, and the periodic vibration is transmitted to the seabed sand through the water permeable membrane, causing it to liquefy.

[0102] The second end of the communication pipeline 510 extends into the liquefied sand on the seabed near the water permeable membrane, and sucks the liquefied sand from the seabed, so as to achieve the purpose of trench excavation and soil breaking on the seabed.

[0103] Since the periodic vibration that can liquefy the seabed sand is mainly generated in the liquefaction tank 200, the impact on surrounding marine organisms is relatively small.

[0104] In the description of the above embodiments, the specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0105] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A subsea trencher based on vibration liquefaction, characterized in that, it includes: A saturated sand liquefaction device, which includes: -- A liquefaction tank, which is a shell structure with a cavity formed inside. A two-way flow part is formed on the shell, and the two-way flow part communicates with the cavity; -- A wave-pushing plate, which moves inside the cavity. A water flow path is formed between the wave-pushing plate and the cavity; the wave-pushing plate is used to push the water in the cavity to flow out from the two-way flow part; a one-way flow part is formed on the wave-pushing plate, and water can flow from the side of the cavity far from the two-way flow part to the side of the cavity close to the two-way flow part through the one-way flow part; A suction device, which includes a connecting pipeline and a driving pump, and the driving pump sucks sand from below the liquefaction tank through the connecting pipeline.

2. The subsea trencher based on vibration liquefaction according to claim 1, characterized in that, The one-way flow part includes a plurality of flow holes opened on the wave-pushing plate and a sealing cover plate. The sealing cover plate is hinged to the side of the flow hole close to the two-way flow part, and the sealing cover plate opens and closes relative to the flow hole under the action of water flow.

3. The subsea trencher based on vibration liquefaction according to claim 1, characterized in that, The two-way flow part is a water-permeable membrane, and water flows into or out of the cavity through the water-permeable membrane.

4. The subsea trencher based on vibration liquefaction according to claim 1, characterized in that, A first communication hole is opened on the side wall of the liquefaction tank, a second communication hole is opened on the wave-pushing plate, and the connecting pipeline passes through the first communication hole and the second communication hole in sequence and then extends out of the wave-pushing plate.

5. The subsea trencher based on vibration liquefaction according to claim 1, characterized in that, The saturated sand liquefaction device further includes a driving part, and the driving part drives the wave-pushing plate to move inside the cavity.

6. The subsea trencher based on vibration liquefaction according to claim 5, characterized in that, The driving part includes a motor and a lead screw assembly, and the motor drives the wave-pushing plate to move relative to the two-way flow part inside the cavity through the lead screw assembly.

7. The subsea trencher based on vibration liquefaction according to claim 6, characterized in that, It further includes a connecting part, and the connecting part includes a horizontal cross beam and a plurality of push columns. The horizontal cross beam is connected to the wave-pushing plate through the plurality of push columns; The lead screw assembly includes a lead screw and a nut, and the lead screw is connected to the nut; The nut is fixedly connected to the horizontal cross beam.

8. The subsea trencher based on vibration liquefaction according to claim 5, characterized in that, It further includes a sealing shell, which is sleeved outside the driving part, and the lower end of the sealing shell is hermetically connected to the liquefaction tank.

9. The subsea trencher based on vibration liquefaction according to claim 7, characterized in that, A push column through hole is opened on the liquefaction tank, and the push column passes through the push column through hole and is connected to the wave-pushing plate.

10. The subsea trencher based on vibration liquefaction according to claim 1, characterized in that, A plurality of reinforcing ribs are formed inside the liquefaction tank.

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