Underwater oil storage device

Abstract

The invention relates to the technical field of underwater oil storage, in particular to an underwater oil storage device which comprises an oil storage box body, a sedimentation mechanism is arranged on the oil storage box body and comprises an excavating bin and excavating equipment, the excavating bin is arranged on the lower end face of the oil storage box body, an opening of the excavating bin faces downwards, the excavating equipment is installed in the excavating bin, and a mud discharge pipe is arranged on the surface of the oil storage box body. A mud discharging channel is fixedly arranged on the oil storage box body, a mud suction pipe is installed at the excavating end of the excavating equipment, the mud suction pipe is connected with a slurry pump, the excavating equipment comprises a supporting frame, an excavating mechanical arm, a cutter suction head and a cutter suction driving motor, an excavating bin water inlet is formed in the oil storage box body, and an excavating water inlet channel is fixedly arranged on the oil storage box body. The submarine oil storage tank can sink and be embedded into the deep position of the submarine ground, the oil storage tank body is not prone to being damaged, oil storage is safe, the use cost is low, and installation is convenient and fast. The submarine oil storage tank has the advantages that the submarine oil storage tank can sink and be embedded into the deep position of the submarine ground, and the submarine oil storage tank is not prone to being damaged.

Description

Technical Field

[0001] The invention relates to the technical field of underwater oil storage, in particular to an underwater oil storage device. Background Art

[0002] There are three ways to store oil at sea: above-water storage, surface storage and underwater storage. The technologies of the first two are relatively mature, but the cost of above-water storage platforms is very high. Due to the limitation of the bearing capacity of the supporting structure, the storage capacity cannot be too large. Surface storage is greatly affected by external wind and waves, ocean currents, ice and snow. In contrast, underwater storage has many advantages, because the oil storage tank is located under the water surface, isolated from fire sources and lightning, with low oil and gas loss and natural explosion-proof performance. At the same time, it avoids the impact of wave washing, the tank capacity is not limited, and it has huge The oil storage capacity of the concrete water circulation oil storage tank is improved. After searching, the Chinese patent CN102700869A discloses a concrete water circulation oil storage tank. First, in the dock, a storage tank body with suitable height is prefabricated with concrete. An oil hole is set at the bottom of the partition wall, and an oil hole is set at the upper part of the partition wall. After the water inlet and outlet are set on the lower side of the oil storage tank body, the water inlet and outlet are temporarily blocked, and then an oil delivery steel pipe is installed and fixed to the oil storage tank body. An oil delivery hose is installed on the top of the oil delivery steel pipe, and an oil delivery pipe cover is installed on the top of the oil delivery hose. The shortcomings of the above patents are: The oil storage tank of the above-mentioned patent stands on the seabed, is not fixed, and will be impacted by passing ships and waves. The oil storage tank is unstable and has a high risk of damage. Once the tank is damaged, fuel will leak and pollute the environment. At the same time, a new oil storage tank needs to be replaced, which increases the cost of oil storage. Secondly, when the above-mentioned patent is in use, the oil storage tank sinks and the sealing cover of the oil pipeline is always above the horizontal plane, which means that the oil storage tank of the above-mentioned patent can only be installed in the diving area and is inconvenient to install in deep water areas. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the prior art and to provide an underwater oil storage device which has a stable structure, can be sunk and embedded deep in the seabed, has an oil storage box that is not easily damaged, stores oil safely and without leakage, has a low cost of use, and is easy and quick to install.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: An underwater oil storage device includes an oil storage tank, characterized in that: a sinking mechanism is provided on the oil storage tank, the sinking mechanism is connected to the oil storage tank, and drives the oil storage tank to sink and embed into the seabed ground. By fixing the oil storage tank to the seabed ground, the structure is stable and not easy to be damaged.

[0005] The sinking mechanism of the present invention includes an excavation chamber and an excavation device. The lower end surface of the oil storage tank body is provided with an excavation chamber, the excavation chamber opening faces downward, and the excavation device is installed in the excavation chamber so that the seabed surface can be excavated by the excavation device, so that the oil storage tank body loses bottom support and sinks downward, embedding deep into the seabed surface, with high safety and not easy to be damaged.

[0006] The top of the oil storage tank body of the present invention is provided with a mud discharge pipe, and the oil storage tank body is fixedly provided with a mud discharge channel, one end of the mud discharge pipe is a free end, and the other end is fixedly connected to the upper end of the mud discharge channel, and the lower end of the mud discharge channel is connected to the mud discharge port of the slurry pump through a mud and water pipeline. The slurry pump is installed on the excavation equipment, and the excavation end of the excavation equipment is provided with a mud suction pipe, and one end of the mud suction pipe is fixedly connected to the mud suction port of the slurry pump, so that the mud and water mixture at the lower end of the excavation bin is discharged to the surrounding waters or ships through the mud suction pipe, the mud and water pipeline, the mud discharge channel and the mud discharge pipe by the slurry pump, so that the oil storage tank body loses bottom support and sinks.

[0007] The excavation equipment described in the present invention includes a supporting frame, an excavation mechanical arm, a cutting suction head, and a cutting suction driving motor. The supporting frame is provided in the excavation chamber, and the supporting frame is fixedly connected to the inner wall of the excavation chamber. The excavation mechanical arm is rotatably connected to the supporting frame via a slewing bearing, and the slewing bearing is driven by a slewing driving cylinder. The excavation mechanical arm is provided with a cutting suction driving motor, and the cutting suction driving motor is fixedly connected to the excavation mechanical arm. A cutting suction head is fixed on the output shaft of the cutting suction driving motor, and the other end of the mud suction pipe is arranged toward the cutting suction head, so that the cutting suction head can be driven to rotate by the cutting suction driving motor to continuously excavate the seabed ground, so that the mud on the seabed ground is loosened, and then the mud and water are pumped out through the mud suction pipe.

[0008] The oil storage tank body of the present invention is provided with an excavation bin water inlet, and the oil storage tank body is fixedly provided with an excavation water inlet channel. The excavation bin water inlet is connected with the excavation bin through the excavation water inlet channel, so that water can be supplied to the excavation bin through the excavation bin water inlet and the excavation water inlet channel, so as to facilitate the suction head to stir the seabed ground.

[0009] The excavation mechanical arm of the present invention comprises a swivel seat, a first excavation arm, a first excavation drive cylinder, a second excavation arm, a second excavation drive cylinder, a third excavation arm, and a third excavation drive cylinder. The swivel seat is rotatably connected to the support frame via a swivel bearing. A first excavation drive cylinder is arranged between the swivel seat and the first excavation arm. The first excavation arm is hinged to the swivel seat. One end of the first excavation drive cylinder is hinged to the swivel seat, and the other end is hinged to the first excavation arm. A second excavation drive cylinder is arranged between the first excavation arm and the second excavation arm. The second excavation arm is hinged to the first excavation arm. One end of the second excavation drive cylinder is hinged to the first excavation arm, and the other end is hinged to the second excavation arm. A third excavation drive cylinder is arranged between the second excavation arm and the third excavation arm. One end of the third excavation arm is hinged to the second excavation arm, and the other end is fixedly connected to the winch suction drive motor. One end of the third excavation drive cylinder is hinged to the second excavation arm, and the other end is hinged to the third excavation arm, so as to drive the entire excavation mechanical arm to rotate through the swivel seat, thereby driving the winch suction head to rotate, and widening the excavation range through the first excavation arm, the second excavation arm, and the third excavation arm.

[0010] The oil storage box of the present invention is provided with a water-oil bin, and the water-oil bin is provided with an oil-water separation float. The oil-water separation float divides the water-oil bin into an oil storage bin and a water bin, the oil storage bin is located above the water bin, the oil-water separation float is slidably connected to the inner wall of the oil storage box, at least one oil storage bin oil port is provided on the surface of the oil storage box, the oil storage bin oil port is communicated with the oil storage bin through a pipeline, at least one water bin water inlet and outlet is provided on the surface of the oil storage box, at least one water bin inlet and outlet is provided on the side wall of the oil storage box, the water bin water inlet and outlet is communicated with the water bin through the water bin inlet and outlet pipeline, so as to introduce water into the water bin through the water bin inlet and outlet, or discharge water from the water bin through the water bin inlet and outlet, and fill or take oil from the oil storage bin through the oil storage tank valve.

[0011] The upper outer wall of the oil storage box body of the present invention extends radially outward to form a limiting boss, so as to prevent the oil storage box body from excessively sinking through the limiting boss.

[0012] Due to the adoption of the above structure, the present invention has the advantages of stable structure, can be sunk and embedded deep in the seabed, the oil storage box is not easy to be damaged, the oil storage is safe and leak-proof, the use cost is low, and the installation is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Figure 2 It is a cross-sectional view at one angle of the present invention.

[0015] Figure 3 It is a cross-sectional view from another angle of the present invention.

[0016] Figure 4It is a cross-sectional view from another angle of the present invention.

[0017] Figure 5 It is an enlarged schematic diagram of the excavation equipment of the present invention.

[0018] Figure 6 It is a schematic diagram of a state in which the lower end of the oil storage tank of the present invention is sunk below the seabed.

[0019] Figure 7 It is a schematic diagram of the limiting boss being placed on the seabed after the oil storage tank body caisson of the present invention is in place.

[0020] Figure 8 It is a schematic diagram of injecting oil into the oil storage tank body when the present invention is used.

[0021] Fig. 9 It is a schematic diagram of taking out oil from the oil storage tank when the present invention is used.

[0022] Figure numerals: oil storage tank 1, sedimentation mechanism 2, excavation bin 3, excavation equipment 4, mud discharge pipe 5, mud discharge channel 6, mud and water pipeline 7, slurry pump 8, support frame 9, excavation mechanical arm 10, suction head 11, suction drive motor 12, excavation bin water inlet 13, excavation water inlet channel 14, swivel seat 15, first excavation arm 16, first excavation drive cylinder 17, second excavation arm 18, second excavation drive cylinder 19, third excavation arm 20, third excavation drive cylinder 21, oil-water separation float 22, oil storage bin 23, water bin 24, oil storage bin oil port 25, water bin water outlet 26, water bin inlet and outlet pipe 27, limiting boss 28. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0024] An underwater oil storage device includes an oil storage tank 1, characterized in that: a sinking mechanism 2 is provided on the oil storage tank 1, the sinking mechanism 2 is connected to the oil storage tank 1, and drives the oil storage tank 1 to sink and embed into the seabed ground. By fixing the oil storage tank to the seabed ground, the structure is stable and not easy to be damaged.

[0025] The sinking mechanism 2 of the present invention includes an excavation chamber 3 and an excavation device 4. The lower end surface of the oil storage tank 1 is provided with an excavation chamber 3, and the excavation chamber 3 is opened downward. The excavation device 4 is installed in the excavation chamber 3, so that the seabed can be excavated by the excavation device, so that the oil storage tank loses its bottom support and sinks downward, embedding deep into the seabed, with high safety and not easy to be damaged.

[0026] A mud discharge pipe 5 is provided on the top of the oil storage tank 1 of the present invention, and a mud discharge channel 6 is fixedly provided on the oil storage tank 1. One end of the mud discharge pipe 5 is a free end, and the other end is fixedly connected to the upper end of the mud discharge channel 6. The lower end of the mud discharge channel 6 is connected to the mud discharge port of a slurry pump 8 through a mud and water pipeline 7. The slurry pump 8 is installed on the excavation equipment 4. A mud suction pipe is installed at the excavation end of the excavation equipment 4, and one end of the mud suction pipe is connected to the mud suction port of the slurry pump 8, so that the mud and water mixture at the lower end of the excavation bin is discharged to the surrounding waters or ships through the mud suction pipe, the mud and water pipeline, the mud discharge channel and the mud discharge pipe by the slurry pump, so that the oil storage tank loses its bottom support and sinks.

[0027] The excavation equipment 4 described in the present invention includes a support frame 9, an excavation mechanical arm 10, a suction head 11, and a suction drive motor 12. The excavation chamber 3 is provided with a support frame 9, and the support frame 9 is fixedly connected to the inner wall of the excavation chamber 3. The excavation mechanical arm 10 is rotatably connected to the support frame 9 via a slewing bearing, and the slewing bearing is driven by a slewing drive cylinder. The excavation mechanical arm 10 is provided with a suction drive motor 12, and the suction drive motor 12 is fixedly connected to the excavation mechanical arm 10. A suction head 11 is fixed on the output shaft of the suction drive motor 12, and the other end of the mud suction pipe is arranged toward the suction head 11, so that the suction head can be driven to rotate by the suction drive motor to continuously excavate the seabed ground, so that the soil on the seabed ground is loosened, and then the mud and water are pumped out through the mud suction pipe.

[0028] The oil storage tank body 1 of the present invention is provided with an excavation bin water inlet 13, and an excavation water inlet channel 14 is fixedly provided on the oil storage tank body 1. The excavation bin water inlet 13 is connected with the excavation bin 3 through the excavation water inlet channel 14, so as to supply water to the excavation bin through the excavation bin water inlet and the excavation water inlet channel, so as to facilitate the suction head to stir the seabed ground.

[0029] The excavation mechanical arm 10 of the present invention comprises a swivel seat 15, a first excavation arm 16, a first excavation drive cylinder 17, a second excavation arm 18, a second excavation drive cylinder 19, a third excavation arm 20, and a third excavation drive cylinder 21. The swivel seat 15 is rotatably connected to the support frame 9 via a swivel bearing. A first excavation drive cylinder 17 is provided between the swivel seat 15 and the first excavation arm 16. The first excavation arm 16 is hinged to the swivel seat 15. One end of the first excavation drive cylinder 17 is hinged to the swivel seat 15, and the other end is hinged to the first excavation arm 16. A second excavation drive cylinder 19 is provided between the first excavation arm 16 and the second excavation arm 18. The digging arm 18 is hinged to the first digging arm 16, one end of the second digging drive cylinder 19 is hinged to the first digging arm 16, and the other end is hinged to the second digging arm 18, a third digging drive cylinder 21 is provided between the second digging arm 18 and the third digging arm 20, one end of the third digging arm 20 is hinged to the second digging arm 18, and the other end is fixedly connected to the suction drive motor 12, one end of the third digging drive cylinder 21 is hinged to the second digging arm 18, and the other end is hinged to the third digging arm 20, so as to drive the entire excavation mechanical arm to rotate through the swivel seat, and then drive the suction head to rotate, so as to widen the excavation range through the first digging arm, the second digging arm and the third digging arm.

[0030] The oil storage box 1 of the present invention is provided with a water-oil bunker, and the water-oil bunker is provided with an oil-water separation float 22. The oil-water separation float 22 divides the water-oil bunker into an oil storage bunker 23 and a water bunker 24. The oil storage bunker 23 is located above the water bunker 24. The oil-water separation float 22 is slidably connected to the inner wall of the oil storage box 1. At least one oil bunker oil port 25 is provided on the surface of the oil storage box 1. The oil bunker oil port 25 is communicated with the oil bunker 23 through a pipeline. At least one water bunker water outlet 26 is provided on the surface of the oil storage box 1. At least one water bunker inlet and outlet pipe 27 is provided on the side wall of the oil storage box 1. The water bunker water outlet 26 is communicated with the water bunker 24 through the water bunker inlet and outlet pipe 27, so as to introduce water into the water bunker through the water bunker outlet, or discharge water from the water bunker through the water bunker outlet, and fill or take oil into the oil bunker through the oil storage tank valve.

[0031] The upper outer wall of the oil storage box body 1 of the present invention extends radially outward to form a limiting boss 28, so as to prevent the oil storage box body 1 from excessively sinking through the limiting boss.

[0032] As attached Figure 1-9In the present invention, the oil storage tank body 1 adopts a prefabricated concrete tank body, which is composed of a water-oil tank and an excavation tank 3 from top to bottom. The inner wall of the water-oil tank is separated by an oil-water separation float 22. The oil storage tank 23 is located above the oil-water separation float 22, and the water tank 24 is located below. The lower end of the excavation tank 3 is open, and an excavation device 4 is arranged in the excavation tank 3. A robot control system can be arranged on the support frame 9. The robot control system, such as a PLC control system, can be installed on the support frame 9 and the excavation mechanical arm 10. Existing equipment such as lighting and cameras can be installed. These equipment and the slurry pump 8, the suction drive motor 12, the first excavation drive cylinder 17, the second excavation drive cylinder 19, and the third excavation drive cylinder 21 are all connected to the robot control system and controlled by the robot control system. The robot control system can be connected to the ship control system through a cable, so that the operator can always understand the underwater situation on the ship. At the same time, the cable is used to transmit power to the excavation equipment 4, such as the attached Figure 3 The cable can enter the excavation bin 3 through the excavation bin water inlet 13 and the excavation water inlet channel 14 and be connected to the robot control system. The present invention uses the suction head 11 to suck and the slurry pump 8 to pump, and the mud and water mixture is discharged to the surrounding waters or ships through the mud suction pipe, the mud and water pipeline 7, the mud discharge channel 6, and the mud discharge pipe 5. The excavation bin water inlet 13 can be connected to the water pump through a water pipe, and the water pump is driven to continuously replenish water to the soil extraction bin through the excavation bin water inlet 13 and the excavation water inlet channel 14 to ensure the suction demand. Since the soil support at the bottom of the oil storage tank 1 is hollowed out, the oil storage tank 1 loses its bottom support and continues to sink downward as a whole. This cycle continues until the oil storage tank 1 sinks to a specified depth, and a limiting boss 28 is formed on the upper outer part of the oil storage tank 1. When the oil storage tank 1 sinks into place, the limiting boss 28 contacts the seabed as a whole to prevent the oil storage tank 1 from sinking excessively as a whole. The present invention does not require an electric system for oil filling, oil extraction, and daily maintenance, and has almost zero maintenance cost.

[0033] When in use, the ship tows the present invention to the designated waters, vertically sinks the present invention to the seabed, starts the excavation equipment 4 to perform underwater excavation until the tank reaches the designated depth below the seabed. Specifically, after the ship tows the present invention to the designated location, the oil port 25 of the oil storage tank can be installed with an oil pipe, and a valve is installed on the oil pipe. The oil port 25 of the oil storage tank is opened, As attached Figure 4 , Attachment Figure 6 , Attachment Figure 7Under the action of its own weight, the external water enters the water tank 24 from the water tank outlet 26, pushing the oil-water separation float 22 to move upward, squeezing the air in the oil storage tank 23, and the air in the oil storage tank is discharged through the oil storage tank oil port 25. After the air is discharged, the overall buoyancy of the present invention becomes smaller and begins to sink. The valve of the oil pipe on the oil storage tank oil port 25 can be controlled to control the sinking speed of the present invention. At the same time, the excavation equipment 4 is started, the suction drive motor 12 is started, the suction head 11 is driven to suck, and the slurry pump 8 is started to discharge the mud-water mixture through the mud suction pipe, the mud-water pipeline 7, the mud discharge channel 6, and the mud discharge pipe 5 to the surrounding waters or ships. At the same time, in order to ensure the rapid suction of the winch head 11, the water inlet 13 of the excavation bin can be connected to the water pump through a water pipe, and the water pump is driven to continuously replenish water to the soil taking bin through the water inlet 13 of the excavation bin and the excavation water inlet channel 14, so as to increase the water content of the soil below the seabed at the lower end of the winch head 11, and facilitate winch suction. Since the soil support at the bottom of the oil storage tank 1 is hollowed out, the oil storage tank 1 loses its bottom support and continuously sinks downward, and this cycle continues until the oil storage tank 1 sinks to a specified depth, as shown in the attached figure. Figure 7 As shown, the limiting boss 28 is placed on the seabed, and the oil storage tank 1 is sunk to a specified depth. When the present invention is settled in place, as shown in the attached Figure 8 , the oil to be stored is injected into the oil storage tank 23 through the oil storage tank oil port 25. As the oil storage volume increases, the oil-water separation float 22 moves downward, and the water in the water tank 24 is discharged through the water tank inlet and outlet pipe 27 and the water tank outlet 26. After the oil filling is completed, the valve of the oil pipe on the oil storage tank oil port 25 is closed, and the oil filling pipeline is removed. Since the density of oil is smaller than that of water and oil and water are incompatible, the oil is stably sealed in the oil storage tank 23 due to the pressure of water. As attached Fig. 9 When it is necessary to take oil from the oil storage tank 1, the external oil taking equipment is connected to the oil port 25 of the oil storage tank through the oil taking pipeline. An oil pump can be installed on the oil taking pipeline. The valve on the oil pipe on the oil port 25 of the oil storage tank is opened, and external water enters the water tank 24 through the water tank outlet 26 and the water tank inlet and outlet pipe 27. The oil-water separation float 22 moves upward, and the oil in the oil storage tank 23 reaches the water surface and enters the oil taking vessel under the combined action of water pressure and the oil pump of the oil taking pipeline.

[0034] Compared with the prior art, the oil storage tank 1 of the present invention is equipped with a sinking mechanism 2, which can be quickly sunk below the seabed through the excavation bin 3 and the excavation equipment 4, and is fixed by the mud and silt on the seabed. The installation is convenient and fast. Only the upper end of the oil storage tank 1 is exposed to the seabed, and it will not shake. It has high safety and will not be damaged or leaked. At the same time, because it is equipped with the excavation equipment 4, the present invention is not limited to the depth of the seabed, and can be used in shallow water areas as well as deep water areas. It does not require daily maintenance and has a low cost of use.

[0035] Due to the adoption of the above structure, the present invention has the advantages of stable structure, being able to be sunk and embedded deep in the seabed, the oil storage box being not easy to be damaged, safe oil storage, no leakage, low use cost, and convenient and quick installation.

Claims

1. An underwater oil storage device, comprising an oil storage tank (1), characterized in that: The oil storage tank body (1) is provided with a sinking mechanism (2), the sinking mechanism (2) is connected to the oil storage tank body (1), and drives the oil storage tank body (1) to sink and embed into the seabed.

2. An underwater oil storage device according to claim 1, characterized in that: The sinking mechanism (2) comprises an excavation chamber (3) and an excavation device (4); the lower end surface of the oil storage tank (1) is provided with an excavation chamber (3); the excavation chamber (3) opens downward, and the excavation device (4) is installed in the excavation chamber (3).

3. An underwater oil storage device according to claim 2, characterized in that: A mud discharge pipe (5) is provided on the top of the oil storage tank (1), and a mud discharge channel (6) is fixedly provided on the oil storage tank (1). One end of the mud discharge pipe (5) is a free end, and the other end is fixedly connected to the upper end of the mud discharge channel (6). The lower end of the mud discharge channel (6) is connected to the mud discharge port of a slurry pump (8) through a mud-water pipeline (7). The slurry pump (8) is installed on the excavation equipment (4). A mud suction pipe is installed on the excavation end of the excavation equipment (4), and one end of the mud suction pipe is fixedly connected to the mud suction port of the slurry pump (8).

4. An underwater oil storage device according to claim 3, characterized in that: The excavation equipment (4) comprises a support frame (9), an excavation mechanical arm (10), a suction head (11), and a suction drive motor (12). The support frame (9) is provided in the excavation chamber (3), and the support frame (9) is fixedly connected to the inner wall of the excavation chamber (3). The excavation mechanical arm (10) is rotatably connected to the support frame (9) via a slewing bearing, and the slewing bearing is driven by a slewing drive cylinder. The excavation mechanical arm (10) is provided with a suction drive motor (12), and the suction drive motor (12) is fixedly connected to the excavation mechanical arm (10). The suction head (11) is fixed on the output shaft of the suction drive motor (12), and the other end of the mud suction pipe is arranged toward the suction head (11).

5. An underwater oil storage device according to claim 2, 3 or 4, characterized in that: An excavation bin water inlet (13) is provided on the oil storage box (1), and an excavation water inlet channel (14) is fixedly provided on the oil storage box (1). The excavation bin water inlet (13) is connected to the excavation bin (3) via the excavation water inlet channel (14).

6. An underwater oil storage device according to claim 4, characterized in that: The excavation mechanical arm (10) comprises a swivel seat (15), a first excavation arm (16), a first excavation drive cylinder (17), a second excavation arm (18), a second excavation drive cylinder (19), a third excavation arm (20), and a third excavation drive cylinder (21); the swivel seat (15) is rotatably connected to a support frame (9) via a swivel bearing; a first excavation drive cylinder (17) is provided between the swivel seat (15) and the first excavation arm (16); the first excavation arm (16) is hinged to the swivel seat (15); one end of the first excavation drive cylinder (17) is hinged to the swivel seat (15), and the other end is hinged to the first excavation arm (16); the first excavation arm (16) is hinged to the swivel seat (15); 6) and a second excavation drive cylinder (19), the second excavation arm (18) being hinged to the first excavation arm (16), one end of the second excavation drive cylinder (19) being hinged to the first excavation arm (16), and the other end being hinged to the second excavation arm (18), a third excavation drive cylinder (21) being provided between the second excavation arm (18) and the third excavation arm (20), one end of the third excavation arm (20) being hinged to the second excavation arm (18), and the other end being fixedly connected to the suction drive motor (12), one end of the third excavation drive cylinder (21) being hinged to the second excavation arm (18), and the other end being hinged to the third excavation arm (20).

7. An underwater oil storage device according to claim 1 or 2 or 3 or 4 or 6, characterized in that: The oil storage box (1) is provided with a water-oil tank, and the water-oil tank is provided with an oil-water separation float (22). The oil-water separation float (22) divides the water-oil tank into an oil storage tank (23) and a water tank (24). The oil storage tank (23) is located above the water tank (24). The oil-water separation float (22) is slidably connected to the inner wall of the oil storage box (1). The surface of the oil storage box (1) is provided with at least one oil storage tank oil port (25), and the oil storage tank oil port (25) is connected to the oil storage tank (23) through a pipeline. The surface of the oil storage box (1) is provided with at least one water tank water outlet (26). The side wall of the oil storage box (1) is provided with at least one water tank inlet and outlet pipeline (27), and the water tank water outlet (26) is connected to the water tank (24) through the water tank inlet and outlet pipeline (27).

8. An underwater oil storage device according to claim 1, 2, 3, 4 or 6, characterized in that: The upper outer wall of the oil storage box body (1) extends radially outward to form a limiting boss (28).

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