Underwater oil storage device

Abstract

The utility model 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, the sedimentation mechanism 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 utility model 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 oil storage capacity cannot be too large. Surface storage is greatly affected by external wind and waves, ocean currents, ice and snow. In comparison, underwater storage has many advantages, because the oil storage tank is located below 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 influence of wave washing, the tank capacity is not limited, and it has huge The oil storage capacity of the tank is unknown. After searching, Chinese patent CN102700869A discloses a concrete water circulation oil storage tank. First, a tank body of suitable height is prefabricated with concrete in a dock. Oil holes are set at the bottom of the partition wall, and oil holes are set at the upper part of the partition wall. After setting water inlets and outlets on one side of the lower part of the tank body, the water inlets and outlets are temporarily blocked. Then, an oil delivery steel pipe is installed and firmly fixed to the 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 patent are:

[0003] The oil storage tank of the above-mentioned patent stands on the seabed and is not fixed. It will be affected by the impact of 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. This means that the oil storage tank of the above-mentioned patent can only be installed in the diving area, and it is inconvenient to install in deep water areas. Summary of the Invention

[0004] The purpose of the utility model is to solve the deficiencies of the existing technology and provide an underwater oil storage device with a stable structure, which can be sunk deep into the seabed, has an oil storage box that is not easy to be damaged, stores oil safely and without leakage, has low operating costs, and is easy and quick to install.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0006] 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. By fixing the oil storage tank to the seabed, the structure is stable and not easy to be damaged.

[0007] The sinking mechanism of the utility model includes an excavation chamber and an excavation device. The lower end surface of the oil storage tank body is provided with an excavation chamber, and the excavation chamber opening faces downward. The excavation device is installed in the excavation chamber so that the seabed is excavated by the excavation device, so that the oil storage tank body loses its bottom support and sinks downward, embedding deep into the seabed ground, which is highly safe and not easy to be damaged.

[0008] The utility model provides a mud discharge pipe on the top of the oil storage tank body, a mud discharge channel is fixedly provided on the oil storage tank body, 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, 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, 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.

[0009] The excavation equipment of the utility model includes a support frame, an excavation mechanical arm, a cutter suction head, and a cutter suction drive motor.

[0010] A support frame is provided in the excavation chamber, and the support frame is fixedly connected to the inner wall of the excavation chamber.

[0011] The excavation mechanical arm is rotatably connected to the support frame via a slewing bearing, and the slewing bearing is driven by a slewing drive cylinder. The excavation mechanical arm is provided with a cutter suction drive motor, and the cutter suction drive motor is fixedly connected to the excavation mechanical arm. A cutter suction head is fixed on the output shaft of the cutter suction drive motor, and the other end of the mud suction pipe is arranged toward the cutter suction head, so that the cutter suction head is driven to rotate by the cutter suction drive motor to continuously excavate the seabed ground, loosen the soil on the seabed ground, and then extract the mud and water through the mud suction pipe.

[0012] The oil storage tank body of the utility model is provided with an excavation bin water inlet, and an excavation water inlet channel is fixedly provided on the oil storage tank body. The excavation bin water inlet is connected with the excavation bin through the excavation water inlet channel, so that water is supplied to the excavation bin through the excavation bin water inlet and the excavation water inlet channel, which facilitates the suction head to stir the seabed ground.

[0013] The excavation mechanical arm of the utility model includes 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.

[0014] The swivel seat is rotatably connected to the support frame via a swivel bearing, and a first excavation drive cylinder is provided between the swivel seat and the first excavation arm, and 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, and a second excavation drive cylinder is provided between the first excavation arm and the second excavation arm, and 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, and a third excavation drive cylinder is provided 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 cutter 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, and then drive the cutter suction head to rotate, thereby widening the excavation range through the first excavation arm, the second excavation arm and the third excavation arm.

[0015] The utility model provides an oil storage tank with a water-oil tank, an oil-water separation float plug is provided in the water-oil tank, and the oil-water separation float plug divides the water-oil tank into an oil storage tank and a water tank. The oil storage tank is located above the water tank, and the oil-water separation float plug is slidably connected to the inner wall of the oil storage tank. The surface of the oil storage tank body is provided with at least one oil storage tank oil port, and the oil storage tank oil port is communicated with the oil storage tank through a pipeline. The surface of the oil storage tank body is provided with at least one water tank inlet and outlet, and the side wall of the oil storage tank body is provided with at least one water tank inlet and outlet pipe. The water tank inlet and outlet are communicated with the water tank through the water tank inlet and outlet pipe, so that water can be introduced into the water tank through the water tank inlet and outlet, or the water in the water tank can be discharged through the water tank inlet and outlet, and the oil storage tank can be filled with oil or taken out of oil through the oil storage tank valve port.

[0016] The outer wall of the upper portion of the oil storage box body of the utility model extends radially outward to form a limiting boss, so as to prevent the oil storage box body from excessively sinking through the limiting boss.

[0017] Due to the above structure, the utility model has the advantages of stable structure, can be sunk and embedded deep into 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

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Figure 2 It is a cross-sectional view of the utility model at one angle.

[0020] Figure 3 It is a cross-sectional view of the utility model from another angle.

[0021] Figure 4 It is a cross-sectional view of the utility model from another angle.

[0022] Figure 5 It is an enlarged schematic diagram of the excavating equipment of the present utility model.

[0023] Figure 6 It is a schematic diagram of a state in which the lower end of the oil storage tank of the utility model is sunk below the seabed.

[0024] Figure 7 It is a schematic diagram of the utility model in which the limiting boss is placed on the seabed after the oil storage tank body is caissoned in place.

[0025] Figure 8 It is a schematic diagram of injecting oil into the oil storage tank when the utility model is used.

[0026] Figure 9 It is a schematic diagram of taking out oil from the oil storage tank when the utility model is used.

[0027] Figure 1: 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, cutter suction head 11, cutter suction drive motor 12, excavation bin water inlet 13, excavation water inlet channel 14, slewing 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 tank 24, oil storage bin oil port 25, water tank outlet 26, water tank inlet and outlet pipe 27, limiting boss 28. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings.

[0029] 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, and 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. By fixing the oil storage tank to the seabed, the structure is stable and not easy to be damaged.

[0030] 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 body 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 is excavated by the excavation device, so that the oil storage tank body loses its bottom support and sinks downward, embedding deep into the seabed ground, with high safety and not easy to be damaged.

[0031] The utility model provides a mud discharge pipe 5 on the top of the oil storage tank body 1, and a mud discharge channel 6 is fixedly provided on the oil storage tank body 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 the slurry pump 8 through the mud and water pipeline 7. The slurry pump 8 is installed on the excavation equipment 4. The excavation end of the excavation equipment 4 is equipped with a mud suction pipe, 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, mud and water pipeline, mud discharge channel, and mud discharge pipe by the slurry pump, so that the oil storage tank body loses bottom support and sinks.

[0032] The excavation equipment 4 of the present invention includes a support frame 9, an excavation mechanical arm 10, a cutting suction head 11, and a cutting suction drive motor 12. A 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. A cutting suction drive motor 12 is provided on the excavation mechanical arm 10, and the cutting suction drive motor 12 is fixedly connected to the excavation mechanical arm 10. A cutting suction head 11 is fixed on the output shaft of the cutting suction drive motor 12, and the other end of the mud suction pipe is arranged toward the cutting suction head 11, so that the cutting suction head is driven to rotate by the cutting suction drive motor, and the seabed is continuously excavated to loosen the soil on the seabed, and then the mud and water are extracted through the mud suction pipe.

[0033] The oil storage tank body 1 of the utility model 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 that water can be supplied to the excavation bin through the excavation bin water inlet and the excavation water inlet channel, making it convenient for the suction head to stir the seabed.

[0034] The excavation mechanical arm 10 of the present invention includes 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.

[0035] The slewing seat 15 is rotatably connected to the support frame 9 via a slewing bearing. A first excavation drive cylinder 17 is provided between the slewing seat 15 and the first excavation arm 16. The first excavation arm 16 is hinged to the slewing seat 15. One end of the first excavation drive cylinder 17 is hinged to the slewing 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 second excavation arm 18 is hinged to the first excavation arm 16. One end of the second excavation drive cylinder 19 is hinged to the first excavation arm 16. The third excavation drive cylinder 21 is provided between the second excavation arm 18 and the third excavation arm 20, and one end of the third excavation arm 20 is hinged to the second excavation arm 18, and the other end is fixedly connected to the suction drive motor 12. The third excavation drive cylinder 21 is hinged to the second excavation arm 18 at one end, and to the third excavation arm 20 at the other end, so as to drive the entire excavation arm to rotate through the slewing seat, and then drive the suction head to rotate, thereby widening the excavation range through the first excavation arm, the second excavation arm and the third excavation arm.

[0036] The oil storage tank body 1 of the present invention is provided with a water-oil tank, and an oil-water separation float 22 is provided in the water-oil tank. 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 tank body 1. At least one oil storage tank oil port 25 is provided on the surface of the oil storage tank body 1. The oil storage tank oil port 25 is communicated with the oil storage tank 23 through a pipeline. At least one water tank water outlet 26 is provided on the surface of the oil storage tank body 1. At least one water tank inlet and outlet pipe 27 is provided on the side wall of the oil storage tank body 1. The water tank water outlet 26 is communicated with the water tank 24 through the water tank inlet and outlet pipe 27, so that water can be introduced into the water tank through the water tank outlet, or the water in the water tank can be discharged through the water tank outlet, and the oil storage tank can be filled with oil or taken out of oil through the oil storage tank valve.

[0037] The upper outer wall of the oil storage tank body 1 of the present invention extends radially outward to form a limiting boss 28, so as to prevent the oil storage tank body 1 from excessively sinking through the limiting boss.

[0038] As attached Figure 1-9, the oil storage tank body 1 of the utility model 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 above the oil-water separation float 22, and the water tank 24 is below. The lower end of the excavation tank 3 is open, and an excavation equipment 4 is arranged in the excavation tank 3. A robot control system can be set 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 devices are connected to the robot control system with the slurry pump 8, the cutter suction drive motor 12, the first excavation drive cylinder 17, the second excavation drive cylinder 19, and the third excavation drive cylinder 21. They are controlled by the robot control system. The robot control system can be connected to the ship's control system through a cable, which is convenient for the operator on the ship to understand the underwater situation at any time. At the same time, power is transmitted to the excavation equipment 4 through the cable, as shown in the attached Figure 3 The cable can enter the excavation chamber 3 through the excavation chamber water inlet 13 and the excavation water inlet channel 14 and be connected to the robot control system. The utility model uses the suction head 11 to suck and the slurry pump 8 to pump the mud and water mixture to the surrounding waters or ships through the mud suction pipe, mud and water pipeline 7, mud discharge channel 6, and mud discharge pipe 5. The excavation chamber water inlet 13 can be connected to the water pump through the water pipe. The water pump is driven to continuously replenish water to the soil borrowing chamber through the excavation chamber water inlet 13 and the excavation water inlet channel 14 to meet 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 the specified depth, and a limit 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 limit boss 28 contacts the seabed as a whole to prevent the oil storage tank 1 from sinking excessively as a whole. The utility model does not require an electric system for oil filling, oil extraction, and daily maintenance, and has almost zero maintenance cost.

[0039] Use a ship to tow the utility model to the designated waters, sink the utility model vertically to the seabed, start the excavation equipment 4 to perform underwater excavation until the tank reaches the designated depth below the seabed. Specifically, after the ship tows the utility model 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. Open the oil port 25 of the oil storage tank,

[0040] 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 of the utility model, 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 utility model becomes smaller and begins to sink. By controlling the valve of the oil pipe on the oil storage tank oil port 25, the sinking speed of the utility model can be controlled. At the same time, the excavation equipment 4 is started, the suction drive motor 12 is started, the suction head 11 is driven to suction, and the slurry pump 8 is started to discharge the mud and water mixture to the surrounding waters through the mud suction pipe, mud and water pipeline 7, mud discharge channel 6, and mud discharge pipe 5. Or on a ship, 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 the whole body continues to sink downward. At the same time, in order to ensure the rapid suction of the winch head 11, the excavation bin water inlet 13 can be connected to the water pump through a water pipe. The water pump is driven to continuously replenish water to the soil borrowing bin through the excavation bin water inlet 13 and the excavation water inlet channel 14, thereby increasing the water content of the soil below the seabed at the lower end of the winch head 11, which is convenient for 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 the whole body continues to sink downward. 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.

[0041] When the utility model settles into place, as shown in the attached Figure 8 The oil required for storage 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 with each other, the oil is stably sealed in the oil storage tank 23 due to the pressure of the water.

[0042] As attached Figure 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 on the oil taking pipeline.

[0043] Compared with the existing technology, the oil storage tank body 1 of the utility model has its own sinking mechanism 2, which can be quickly sunk below the seabed through the excavation chamber 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 body 1 is exposed to the seabed ground, and it will not shake. It has high safety and will not be damaged or leaked. At the same time, because it has its own excavation equipment 4, the utility model is not limited to the depth of the seabed. It can be used in shallow water areas and deep water areas. It does not require daily maintenance and has low cost of use.

[0044] Due to the above structure, the utility model has the advantages of stable structure, can be sunk deep into 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.

Claims

1. An underwater oil storage device, comprising an oil storage tank (1), characterized in that: The oil storage tank (1) is provided with a sinking mechanism (2), which is connected to the oil storage tank (1) and drives the oil storage tank (1) to sink and embed into the seabed. The sinking mechanism (2) 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), the excavation chamber (3) opening is downward, and the excavation device (4) is installed in the excavation chamber (3).

2. An underwater oil storage device according to claim 1, 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 the 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).

3. An underwater oil storage device according to claim 2, characterized in that: The excavation equipment (4) includes 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).

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

5. The underwater oil storage device according to claim 3, characterized in that: The excavation mechanical arm (10) comprises a slewing 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 slewing seat (15) is rotatably connected to the support frame (9) via a slewing bearing. A first excavation drive cylinder (17) is provided between the slewing seat (15) and the first excavation arm (16). The first excavation arm (16) is hinged to the slewing seat (15). One end of the first excavation drive cylinder (17) is hinged to the slewing seat (15), and the other end is hinged to the first excavation arm (16). The first excavation arm (1 6) and a second excavation drive cylinder (19) are provided between the second excavation arm (18), the second excavation arm (18) is hinged to the first excavation arm (16), one end of the second excavation drive cylinder (19) is hinged to the first excavation arm (16), and the other end is hinged to the second excavation arm (18), a third excavation drive cylinder (21) is provided between the second excavation arm (18) and the third excavation arm (20), one end of the third excavation arm (20) is hinged to the second excavation arm (18), and the other end is fixedly connected to the suction drive motor (12), one end of the third excavation drive cylinder (21) is hinged to the second excavation arm (18), and the other end is hinged to the third excavation arm (20).

6. An underwater oil storage device according to claim 1, 2, 3 or 5, characterized in that: The oil storage tank (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 tank (1). The surface of the oil storage tank (1) is provided with at least one oil storage tank oil port (25). The oil storage tank oil port (25) is communicated with the oil storage tank (23) through a pipeline. The surface of the oil storage tank (1) is provided with at least one water tank water outlet (26). The side wall of the oil storage tank (1) is provided with at least one water tank inlet and outlet pipe (27). The water tank water outlet (26) is communicated with the water tank (24) through the water tank inlet and outlet pipe (27).

7. An underwater oil storage device according to claim 1, 2, 3 or 5, characterized in that: The upper outer wall of the oil storage tank body (1) extends radially outward to form a limiting boss (28).

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