A connecting device capable of reducing mooring cable load of a marine floating system under typhoon sea conditions and application thereof

Abstract

A connecting device capable of reducing the mooring cable load of a marine floating system under typhoon sea conditions and application thereof, the connecting device comprising a hydraulic outer cylinder, a hydraulic inner cylinder, a hydraulic cylinder piston and an annular piston; an annular cavity is formed between the outer wall of the hydraulic inner cylinder and the hydraulic outer cylinder, the annular piston is slidingly connected in the annular cavity and forms an oil storage cavity between the annular piston and the top of the hydraulic outer cylinder, and an elastic member is arranged between the bottom of the hydraulic outer cylinder and the annular piston; the hydraulic cylinder piston is slidingly connected to the inside of the hydraulic inner cylinder and separates the inside of the hydraulic inner cylinder into an upper inner cylinder cavity and a lower inner cylinder cavity, the upper inner cylinder cavity and the oil storage cavity are filled with hydraulic oil, and the upper inner cylinder cavity and the oil storage cavity are communicated through parallel one-way pressure relief valves and one-way return valves; the connecting device is applied to the connection of a mooring cable component of a ship or an offshore platform, uses hydraulic pressure to provide buffering and release length to the mooring cable, reduces the pulling force on the mooring cable, and belongs to the technical field of marine equipment.

Description

A connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions and its application. Technical Field

[0001] This invention relates to the field of marine equipment technology, specifically to a connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions and its application. Background Technology

[0002] In ports, anchorages, or offshore operating areas, marine buoys, such as ships, are typically secured to docks, pontoons, or seabed anchorages by mooring cables to maintain their positional stability. Under normal sea conditions, the load on the mooring cables is minimal. However, under typhoon conditions, the load increases dramatically, exhibiting a distinct periodicity that coincides with the wave period. Furthermore, when a wave crest passes over the buoy, it creates an impact load on the mooring cable. This impact load lasts only a tenth of a second, but its peak value is instantaneously more than twice the pre-impact value. Under these conditions, the risk of damage and breakage of the mooring cables is very high.

[0003] Current technologies employ a weighted design, suspending weights on the mooring cable and utilizing the inertial force of the weights to cushion the load on the mooring cable. While this technology can partially reduce impact loads, it increases the static load on the mooring cable. Furthermore, the weights affect the underwater configuration of the mooring cable, increasing the space requirements in the sea area. Therefore, its cost-effectiveness is not high, and its application is subject to many limitations.

[0004] Another existing technology employs a combination of weights and levers. The weights are made into long rods, with the mooring cable connected to both ends. The rod's own weight generates a restoring torque for stability. When the mooring cable tension exceeds a certain value, the rod rotates, increasing the effective length of the mooring cable and thus reducing impact loads. However, this existing technology is only suitable for situations where the static tension of the mooring cable is very small. As the static tension of the mooring cable increases, the required weight of the weights increases exponentially, rendering this technology impractical. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the purpose of this invention is to provide a connection device that can reduce the load on the mooring cable of the marine floating system under typhoon sea conditions. It has a compact structure, does not increase the static load, and is suitable for high impact load conditions such as typhoon sea conditions.

[0006] Another objective of this invention is to provide an application of a connection device that can reduce the load on mooring cables of marine floating systems under typhoon sea conditions.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a connecting device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions, comprising a hydraulic outer cylinder, a hydraulic inner cylinder, a hydraulic cylinder piston, and an annular piston; the hydraulic inner cylinder is located inside the hydraulic outer cylinder, and an annular cavity is formed between the outer wall of the hydraulic inner cylinder and the hydraulic outer cylinder; the annular piston is slidably connected in the annular cavity and forms an oil storage chamber between itself and the top of the hydraulic outer cylinder; an elastic element is provided between the bottom of the hydraulic outer cylinder and the annular piston; the hydraulic cylinder piston is slidably connected to... The interior of the hydraulic inner cylinder is divided into an upper cavity and a lower cavity. The upper cavity and the oil reservoir are filled with hydraulic oil. The upper cavity and the oil reservoir are connected by a parallel one-way pressure relief valve and a one-way return valve. The one-way pressure relief valve is open from the upper cavity to the oil reservoir, and the one-way return valve is open from the oil reservoir to the upper cavity. The hydraulic outer cylinder and the hydraulic cylinder piston are each connected to a lifting ring. The two lifting rings are arranged opposite each other for connecting the mooring cable.

[0008] As a preferred embodiment, a closed back pressure chamber is formed between the bottom of the hydraulic outer cylinder and the annular piston and is filled with carbon dioxide fluid in a gas-liquid two-phase state.

[0009] As a preferred option, the lower cavity of the inner cylinder is filled with inert gas.

[0010] As a preferred option, nitrogen is used as the inert gas.

[0011] As a preferred embodiment, the inner diameter of the hydraulic outer cylinder is not less than 1.4 times the outer diameter of the hydraulic inner cylinder.

[0012] As a preferred option, the elastic element is a conical helical spring, with any two adjacent coils on the spring being radially offset, so that the spring can be nested step by step during axial compression.

[0013] As a preferred embodiment, the hydraulic outer cylinder includes a hydraulic cylinder body and a hydraulic cylinder head, which are connected by threads. A first sealing ring is provided between the hydraulic cylinder head and the hydraulic cylinder body. The hydraulic inner cylinder is cylindrical, with its bottom end sealed and welded to the bottom of the hydraulic cylinder body, and a second sealing ring provided between its top end and the hydraulic cylinder head.

[0014] As a preferred embodiment, the one-way pressure relief valve includes a first valve body and a first sealing plug; the first valve body has a first fluid inlet and a first fluid outlet at its two ends, and a fluid channel connecting the first fluid inlet and the first fluid outlet is provided inside the first valve body; the first sealing plug is movably disposed in the fluid channel; one end of the first sealing plug is tapered and faces the first fluid inlet, and a pre-tightened valve spring is provided between the other end and the first valve body; one end of the first sealing plug abuts against the wall of the fluid channel under the elastic force of the valve spring to block the fluid channel; when the pressure difference between the first fluid inlet and the first fluid outlet is greater than the elastic force of the valve spring, the first sealing plug is pushed open to allow the first fluid inlet and the first fluid outlet to conduct.

[0015] As a preferred embodiment, the one-way reflux valve includes a second valve body, a second sealing plug, and a guide plate. The second valve body has a second fluid inlet and a second fluid outlet at both ends, and a fluid channel connecting the second fluid inlet and the second fluid outlet is provided inside the second valve body. The second sealing plug is movably disposed in the fluid channel. One end of the second sealing plug is conical and faces the second fluid inlet, while the other end is fixedly connected to the guide plate, which has multiple guide holes. When the pressure at the second fluid outlet is greater than the pressure at the second fluid inlet, the second sealing plug blocks the second fluid inlet under the action of the pressure difference. When the pressure at the second fluid inlet is greater than the pressure at the second fluid outlet, the second sealing plug is pushed open, allowing the second fluid inlet and the second fluid outlet to connect.

[0016] The above-mentioned connection device for reducing the load on marine floating system mooring cables under typhoon sea conditions is used for mooring cable components of ships or marine platforms. The connection device for reducing the load on marine floating system mooring cables under typhoon sea conditions is connected to the mooring cable in series with two lifting rings to absorb the load borne by the mooring cable.

[0017] In summary, the present invention has the following advantages:

[0018] (1) The present invention utilizes a movable piston structure to connect with mooring cable components (such as anchor chains). When the pulling force of the mooring cable component exceeds a set threshold, the hydraulic cylinder piston moves to release the length of the mooring cable component, so that the pulling force no longer increases sharply and stabilizes within a small range, thereby effectively reducing the peak load of the mooring cable component under typhoon and wave conditions.

[0019] (2) The present invention adopts a recyclable hydraulic design to realize the conversion and reduction of the pulling force of the mooring cable component. The hydraulic oil achieves the circulation flow between the inner and outer chambers through the pushing of the hydraulic cylinder piston and the pushing of the spring and the ring piston of the oil storage cylinder. The back pressure of the oil storage chamber is provided by the carbon dioxide gas-liquid mixture. The whole process is an autonomous response process, which does not need to rely on electricity or other control systems. It has a strong adaptability to the marine environment and has good reliability.

[0020] (3) The present invention adopts a clever modular design, the component structure is simple and universal, the layout is extremely compact and space-saving, the processing and manufacturing cost is low, the assembly is simple, and it has excellent economic benefits.

[0021] (4) Multiple versions of this invention can be used in series to meet different application scenarios and needs, and have excellent scalability. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the overall assembly of the connection device that can reduce the load on the mooring cables of the marine floating system under typhoon sea conditions.

[0023] Figure 2 is a schematic diagram showing the separation between the interior of the hydraulic cylinder and the annular cavity.

[0024] Figure 3 is a cross-sectional schematic diagram of the hydraulic outer cylinder and the hydraulic inner cylinder.

[0025] Figure 4 is a schematic cross-sectional view of the hydraulic cylinder head.

[0026] Figure 5 is a schematic diagram of the hydraulic cylinder piston assembly.

[0027] Figure 6 is a schematic diagram of the assembly of a one-way pressure relief valve.

[0028] Figure 7 is a schematic diagram of the assembly of a one-way reflux valve.

[0029] Figure 8 is a schematic diagram of the connection device and mooring anchor chain connection for reducing the load on the marine floating system mooring cable under typhoon sea conditions.

[0030] Figure 9 is a schematic diagram of the elastic element.

[0031] Among them, 1 is the hydraulic outer cylinder, 2 is the hydraulic cylinder head, 3 is the tie rod, 4 is the piston ring, 5 is the main body ring, 6 is the elastic element, 7 is the annular piston, 8 is the lower cavity of the inner cylinder, 9 is the upper cavity of the inner cylinder, 10 is the back pressure chamber, 11 is the oil storage chamber, 12 is the one-way pressure relief valve, and 13 is the one-way return valve.

[0032] 81 is the hydraulic cylinder body, 82 is the hydraulic inner cylinder, 83 is the hydraulic cylinder body base plate, 85 is the first sealing ring, 86 is the second sealing ring, 87 is the hydraulic cylinder body test connector, and 88 is the main lifting ring connecting plate.

[0033] 21 is the center hole of the hydraulic cylinder head, 22 is the center hole sealing ring, 24 is the second sealing ring mounting groove, and 26 is the first sealing ring mounting groove.

[0034] 31 is the hydraulic cylinder piston, and 34 is the piston seal ring.

[0035] 61 is the valve housing, 63 is the valve end connector, 641 is the first fluid inlet, 642 is the second fluid inlet, 651 is the first sealing plug, 652 is the second sealing plug, 66 is the push rod, 67 is the valve spring, 68 is the connecting rod, and 69 is the guide plate. 72 is the valve cover end connector, 73 is the valve cover sealing ring, 741 is the first fluid outlet, and 742 is the second fluid outlet.

[0036] 101 is a connecting device that can reduce the load on the mooring cable of the marine floating system under typhoon sea conditions; 102 is a detachable buckle; and 103 is a mooring anchor chain. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] As shown in Figures 1-5, a connecting device 101 for reducing the load on mooring cables of a marine floating system under typhoon sea conditions includes a hydraulic outer cylinder 1, a hydraulic inner cylinder 82, a hydraulic cylinder piston 31, and an annular piston 7. The hydraulic inner cylinder 82 is located inside the hydraulic outer cylinder 1, and an annular cavity is formed between the outer wall of the hydraulic inner cylinder 82 and the hydraulic outer cylinder 1. The annular piston 7 is slidably connected in the annular cavity and forms an oil storage chamber 11 between itself and the top of the hydraulic outer cylinder 1. An elastic element 6 is provided between the bottom of the hydraulic outer cylinder 1 and the annular piston 7. The hydraulic cylinder piston 31 is slidably connected inside the hydraulic inner cylinder 82. The hydraulic inner cylinder 82 is internally divided into an upper inner cylinder cavity 9 and a lower inner cylinder cavity 8. The upper inner cylinder cavity 9 and the oil reservoir 11 are filled with hydraulic oil. The upper inner cylinder cavity 9 and the oil reservoir 11 are connected by a parallel one-way pressure relief valve 12 and a one-way return valve 13. The one-way pressure relief valve 12 operates from the upper inner cylinder cavity 9 towards the oil reservoir 11, and the one-way return valve 13 operates from the oil reservoir 11 towards the upper inner cylinder cavity 9. The hydraulic outer cylinder 1 and the hydraulic cylinder piston 31 are each connected to a lifting ring. The two lifting rings are positioned opposite each other and are used to connect the mooring cable. The two lifting rings are the main lifting ring 5 and the piston lifting ring 4, respectively. The piston lifting ring 4 is connected to the hydraulic cylinder piston 31 via a pull rod 3. A piston sealing ring 34 is provided on the outer side of the hydraulic cylinder piston 31.

[0039] The hydraulic outer cylinder 1 is connected to two parallel guide pipes. The one-way pressure relief valve 12 and the one-way return valve 13 can adopt existing structures, and the two are respectively installed on the two guide pipes.

[0040] During typhoon sea conditions, when the mooring cable load reaches a preset threshold, the hydraulic cylinder piston 31 is pulled out. Under pressure, the one-way pressure relief valve 12 opens, and hydraulic oil flows into the oil storage chamber 11. At this time, the hydraulic cylinder piston 31 moves, increasing the effective length of the connecting device 101, which reduces the load on the marine floating mooring cable under typhoon sea conditions. This releases the length to the mooring cable, slowing down the increase in load on the mooring cable and buffering the impact load on the mooring cable under typhoon sea conditions, thereby protecting the mooring cable. Because wave forces exhibit periodic characteristics, after the peak load, it enters a trough. During this period, the pressure in the upper cavity 9 of the inner cylinder decreases, and the hydraulic oil flows back from the oil storage chamber 11 through the one-way return valve 13 to the hydraulic cylinder, pushing the hydraulic cylinder piston 31 back to its original position, retracting the length previously released to reduce load, and resetting the device. In this way, utilizing its own hydraulic and mechanical functions, it can effectively achieve dynamic buffering of wave impact even under high impact load conditions. Furthermore, the entire device has a compact structure, low weight, and does not increase the static load on the mooring cable.

[0041] In some embodiments, a closed back pressure chamber 10 is formed between the bottom of the hydraulic outer cylinder 1 and the annular piston 7, and is filled with carbon dioxide fluid in a gas-liquid two-phase state. Due to the small temperature fluctuations on the ocean, the carbon dioxide fluid has a stable saturated vapor pressure, which can maintain the pressure in the back pressure chamber 10 between about 4 and 7 MPa. It has the effect of stabilizing the pressure, providing a better constant back pressure to the oil storage chamber 11, which can balance the static tension on the device, making the device suitable for mooring cables with greater static pressure.

[0042] In some embodiments, the lower cavity 8 of the inner cylinder is filled with an inert gas, which serves to (1) provide a certain back pressure to the upper cavity 9 of the inner cylinder to prevent the hydraulic cylinder piston 31 from hitting the hydraulic cylinder body bottom plate 83, (2) protect the inner wall metal from oxidation and corrosion during long-term underwater service, and (3) facilitate detection during service and identification of other types of gases that are easily mixed in.

[0043] In some embodiments, the inert gas is nitrogen.

[0044] In some embodiments, the inner diameter of the hydraulic outer cylinder 1 is not less than 1.4 times the outer diameter of the hydraulic inner cylinder 82, so that the volume of the annular cavity is greater than the internal volume of the hydraulic inner cylinder 82, which can ensure that all the hydraulic oil in the hydraulic inner cylinder 82 is delivered into the oil storage chamber 11 under extreme sea conditions, so as to maximize the release of the mooring cable length.

[0045] In some embodiments, as shown in Figure 9, the elastic element 6 is a conical helical spring, with any two adjacent coils of the spring radially offset, allowing the spring to be nested sequentially during axial compression. The number of helical coils of the spring is ≤ (inner diameter of the oil reservoir 11 – outer diameter of the hydraulic inner cylinder 82) / spring cross-sectional width. From the bottom of the hydraulic outer cylinder 1 to the annular piston 7, the outer diameter of the spring gradually decreases in a sloping manner, and under extreme compression, it can be completely contracted into a plane, with a minimum height of 1 times the cross-sectional height. The spring stiffness coefficient ranges from 10% to 30% of the design tension / stroke of the annular piston 7 to ensure that the annular piston 7 can quickly return to its original position.

[0046] In some embodiments, as shown in Figures 3 and 4, the hydraulic outer cylinder 1 includes a hydraulic cylinder body 81 and a hydraulic cylinder cover 2, which are connected by threads. A first sealing ring 85 is provided between the hydraulic cylinder cover 2 and the hydraulic cylinder body 81. The hydraulic inner cylinder 82 is cylindrical, with its bottom end sealed and welded to the bottom of the hydraulic cylinder body 81, and a second sealing ring 86 provided between its top end and the hydraulic cylinder cover 2. After the hydraulic cylinder cover 2 and the hydraulic cylinder body 81 are assembled, a sealed annular cavity and an inner cylinder cavity are formed. The bottom of the hydraulic cylinder body 81 is a hydraulic cylinder body base plate 83, on which a hydraulic cylinder body inspection connector 87 is installed. This connector is used to inject nitrogen and liquefied carbon dioxide into the cylinder body during assembly, and to check the carbon dioxide gas-liquid mixture and nitrogen pressure during device operation or maintenance. The hydraulic cylinder body 81 is connected to the main lifting ring 5 via a main lifting ring connecting plate 88.

[0047] The inner side of the hydraulic cylinder head 2 is provided with a first sealing ring mounting groove 26 and a second sealing ring mounting groove 24, and a hydraulic cylinder head center hole 21 for passing through the tie rod 3 is opened in the middle. The inner wall of the hydraulic cylinder head center hole 21 is provided with a center hole sealing ring 22.

[0048] In some embodiments, as shown in FIG6, the one-way pressure relief valve 12 includes a first valve body and a first sealing plug 651; the first valve body is provided with a first fluid inlet 641 and a first fluid outlet 741 at both ends, and a fluid channel connecting the first fluid inlet 641 and the first fluid outlet 741 is provided inside the first valve body. The first sealing plug 651 is movably disposed in the fluid channel; one end of the first sealing plug 651 is tapered and faces the first fluid inlet 641, and a pre-tightened valve spring 67 is provided between the other end and the first valve body. One end of the first sealing plug 651 abuts against the wall of the fluid channel under the elastic force of the valve spring 67 to block the fluid channel. When the pressure difference between the first fluid inlet 641 and the first fluid outlet 741 is greater than the elastic force of the valve spring 67, the first sealing plug 651 is pushed open to make the first fluid inlet 641 and the first fluid outlet 741 connect.

[0049] The other end of the first sealing plug 651 is connected to a push rod 66, and a valve spring 67 is sleeved on the outside of the push rod 66. One end wall of the fluid channel is a conical surface. Normally, the first sealing plug 651 is in contact with the conical surface under the preload of the valve spring 67 to maintain a seal. The preload of the valve spring 67 is set as: (pressure relief design pressure - back pressure of oil storage chamber 11) × flow channel area of ​​the guide pipe.

[0050] In some embodiments, as shown in FIG7, the one-way reflux valve 13 includes a second valve body, a second sealing plug 652, and a guide plate 69. The second valve body has a second fluid inlet 642 and a second fluid outlet 742 at both ends, and a fluid channel connecting the second fluid inlet 642 and the second fluid outlet 742 is provided inside the second valve body. The second sealing plug 652 is movably disposed in the fluid channel. One end of the second sealing plug 652 is conical and faces the second fluid inlet 642, and the other end is fixedly connected to the guide plate 69. The guide plate 69 has multiple guide holes. When the pressure at the second fluid outlet 742 is greater than the pressure at the second fluid inlet 642, the second sealing plug 652 blocks the second fluid inlet 642 under the action of the pressure difference. When the pressure at the second fluid inlet 642 is greater than the pressure at the second fluid outlet 742, the second sealing plug 652 is pushed open to make the second fluid inlet 642 and the second fluid outlet 742 connect.

[0051] A connecting rod 68 connects the second sealing plug 652 to the guide plate 69. One end wall of the fluid channel is a conical surface. When the pressure at the second fluid outlet 742 is greater than the pressure at the second fluid inlet 642, the second sealing plug 652 fits against the conical surface to maintain a seal.

[0052] Both the first valve body and the second valve body consist of a valve housing 61, a valve end connector 63, a valve cover, and a valve cover end connector 72. The valve end connector 63 is connected to one end of the valve housing 61 and has a through-flow channel inside to form a first fluid inlet 641 or a second fluid inlet 642. One end of the valve cover is threaded to the other end of the valve housing 61, and a valve cover sealing ring 73 is provided between the valve housing 61 and the valve cover. The valve cover end connector 72 is located at the other end of the valve cover and has a flow channel inside to form a first fluid outlet 741 or a second fluid outlet 742. The material density of the first sealing plug 651 and the second sealing plug 652 is equal to that of the hydraulic oil, maintaining a balance between gravity and buoyancy in the hydraulic oil to reduce opening and closing resistance, improve response sensitivity, and enable the connecting device 101, which can reduce the load on the mooring cables of the marine floating system under typhoon sea conditions, to achieve buffering more smoothly and quickly.

[0053] The aforementioned connection device 101, which reduces the load on marine floating mooring cables under typhoon sea conditions, is used for mooring cable components of ships or offshore platforms. The connection device 101, which reduces the load on marine floating mooring cables under typhoon sea conditions, is connected to the mooring cable via a piston ring 4 and a main ring 5 to absorb the load borne by the mooring cable. This provides dynamic protection for mooring cable components (such as mooring anchor chain 103) to reduce the peak load on mooring cable components (such as mooring anchor chain 103) under typhoon wave conditions, as shown in Figure 8. In use, the mooring anchor chain 103 is connected to the piston ring 4 and the main ring 5 via a detachable buckle 102.

[0054] The above embodiments are preferred embodiments of the invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions, characterized in that: It includes a hydraulic outer cylinder, a hydraulic inner cylinder, a hydraulic cylinder piston, and an annular piston. The hydraulic inner cylinder is located inside the hydraulic outer cylinder, and an annular cavity is formed between the outer wall of the hydraulic inner cylinder and the hydraulic outer cylinder. The annular piston is slidably connected in the annular cavity and forms an oil reservoir between itself and the top of the hydraulic outer cylinder. An elastic element is provided between the bottom of the hydraulic outer cylinder and the annular piston. The hydraulic cylinder piston is slidably connected inside the hydraulic inner cylinder and divides the interior of the hydraulic inner cylinder into an upper cavity and a lower cavity. The upper cavity and the oil reservoir are filled with hydraulic oil. The upper cavity of the inner cylinder is connected to the oil reservoir via a parallel one-way pressure relief valve and a one-way return valve. The one-way pressure relief valve is directed from the upper cavity of the inner cylinder toward the oil reservoir, and the one-way return valve is directed from the oil reservoir toward the upper cavity of the inner cylinder. The hydraulic outer cylinder and the hydraulic cylinder piston are each connected to a lifting ring, which are arranged opposite each other for connecting the mooring cable. A closed back pressure cavity is formed between the bottom of the hydraulic outer cylinder and the annular piston and is filled with carbon dioxide fluid in a gas-liquid two-phase state. The lower cavity of the inner cylinder is filled with inert gas.

2. The connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions as described in claim 1, characterized in that: The inert gas is nitrogen.

3. The connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions as described in claim 1, characterized in that: The inner diameter of the hydraulic outer cylinder is not less than 1.4 times the outer diameter of the hydraulic inner cylinder.

4. The connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions according to claim 1, characterized in that: The elastic element is a conical helical spring, with any two adjacent coils on the spring being radially offset, allowing the spring to be nested step by step during axial compression.

5. The connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions according to claim 1, characterized in that: The hydraulic outer cylinder includes a hydraulic cylinder body and a hydraulic cylinder cover, which are connected by threads. A first sealing ring is provided between the hydraulic cylinder cover and the hydraulic cylinder body. The hydraulic inner cylinder is cylindrical, with its bottom end sealed and welded to the bottom of the hydraulic cylinder body, and a second sealing ring provided between its top end and the hydraulic cylinder cover.

6. The connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions according to claim 1, characterized in that: The one-way pressure relief valve includes a first valve body and a first sealing plug. The first valve body has a first fluid inlet and a first fluid outlet at its two ends, and a fluid channel connecting the first fluid inlet and the first fluid outlet is provided inside the first valve body. The first sealing plug is movably disposed in the fluid channel. One end of the first sealing plug is conical and faces the first fluid inlet, and a pre-tightened valve spring is provided between the other end and the first valve body. Under the elastic force of the valve spring, one end of the first sealing plug abuts against the wall of the fluid channel to block the fluid channel. When the pressure difference between the first fluid inlet and the first fluid outlet is greater than the elastic force of the valve spring, the first sealing plug is pushed open to allow the first fluid inlet and the first fluid outlet to conduct.

7. The connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions according to claim 1, characterized in that: The one-way reflux valve includes a second valve body, a second sealing plug, and a guide plate. The second valve body has a second fluid inlet and a second fluid outlet at both ends, and a fluid channel connecting the second fluid inlet and the second fluid outlet is provided inside the second valve body. The second sealing plug is movably disposed in the fluid channel. One end of the second sealing plug is conical and faces the second fluid inlet, while the other end is fixedly connected to the guide plate, which has multiple guide holes. When the pressure at the second fluid outlet is greater than the pressure at the second fluid inlet, the second sealing plug blocks the second fluid inlet under the action of the pressure difference. When the pressure at the second fluid inlet is greater than the pressure at the second fluid outlet, the second sealing plug is pushed open, allowing the second fluid inlet and the second fluid outlet to communicate.

8. The application of the connection device for reducing the load on mooring cables of marine floating systems under typhoon sea conditions as described in any one of claims 1 to 7, characterized in that: Mooring cable components used for ship mooring or offshore platforms, connecting devices that reduce the load on marine floating mooring cables during typhoon sea conditions are connected in series with two shackles to absorb the load borne by the mooring cable.

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