Hydraulic locking device of FPSO single-point mooring system and mounting method of hydraulic locking device

Abstract

The invention relates to the technical field of ocean engineering, in particular to an FPSO single point mooring system hydraulic locking device and an installation method thereof.The FPSO single point mooring system hydraulic locking device comprises a guide frame assembly fixedly connected to the surface of a ship deck around a moon pool opening, a sliding shoe assembly is arranged in the guide frame assembly in a sliding mode, and a locking assembly is hinged to the top face of the sliding shoe assembly; the sliding shoe assembly drives the locking assembly to slide back and forth along the guide frame assembly; the locking assembly comprises a locking arm, the end, matched with the buoy, of the locking arm is a locking end, and the other end of the locking assembly is a connecting end. The connecting end is hinged to the support assembly. Due to the design of the guide frame assembly and the guide assembly, the stability and accuracy of the locking arm in the sliding process are guaranteed, and potential safety hazards caused by shaking or deviation are avoided. And meanwhile, the stability of the device in the locking state is further enhanced through the arrangement of the fixing assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of ocean engineering, and in particular to a hydraulic locking device for an FPSO single point mooring system and an installation method thereof. Background Technique

[0002] Using FPSO ships (i.e., floating production storage and offloading vessels) for oil and gas development is one of the important models for offshore oilfield development in China. After decades of development, a series of important progress has been made in China in aspects such as the overall design of FPSO hulls, the design of upper modules, the construction, commissioning and offshore installation of FPSOs, and the overall project contracting management. In the mooring system of FPSO ships, the single point mooring system has the advantages of a wide applicable water depth range, mature and reliable technology, strong anti-wind and wave resistance, and simple maintenance, and is also the preferred mooring solution for newly built FPSO ships and retrofitted FPSO ships in recent years. In the floating pontoon type internal turret single point mooring system, the locking mechanism plays a crucial role in the disconnection and reconnection processes of FPSO ships.

[0003] There is a moonpool opening in the turret area of the FPSO ship hull. The conical pontoon enters the moonpool opening and is connected to the offshore floating platform through a locking device. For example, in a Chinese invention patent with the publication number CN111452913B and the name of a claw type locking device for single point mooring, the locking method adopts double locking of a hydraulic cylinder and a mechanism. During the disconnection and reconnection processes of the locking mechanism, hinge points need to cooperate with each other, the structure is relatively complex, the hydraulic cylinder is in a pressure state for a long time, and the cylinder is prone to failure, affecting the reconnection of the locking mechanism. In view of this, a hydraulic locking device for an FPSO single point mooring system and an installation method thereof are provided. Summary of the Invention

[0004] The main purpose of the present invention is to provide a hydraulic locking device for an FPSO single point mooring system to solve the problems in the related technology, such as double locking of a hydraulic cylinder and a mechanism, the need for hinge points to cooperate with each other during the disconnection and reconnection processes of the locking mechanism, the relatively complex structure, the long-term pressure state of the hydraulic cylinder, and the easy occurrence of cylinder failures, which affect the reconnection of the locking mechanism.

[0005] To achieve the above purpose, according to one aspect of the present invention, a hydraulic locking device for an FPSO single point mooring system is provided, which includes a guide frame assembly fixedly connected to the surface of the ship deck around the moonpool opening. A sliding shoe assembly is slidably arranged in the guide frame assembly. The top surface of the sliding shoe assembly is hinged with a locking assembly, and the sliding shoe assembly drives the locking assembly to reciprocate along the guide frame assembly;

[0006] Wherein, the locking assembly includes a locking arm. The end of the locking arm that cooperates with the pontoon is set as a locking end, and the other end of the locking assembly is set as a connection end; the connection end is hinged to a support assembly;

[0007] The bracket assembly is arranged in an L-shaped structure. A hydraulic cylinder is hinged downward at the top inside the L-shaped structure, and the end of the telescopic rod of the hydraulic cylinder is hinged to the connection end of the locking arm.

[0008] A guiding assembly is arranged inside the horizontal section of the bracket assembly, and the guiding assembly supports and guides the movement of the locking arm.

[0009] A fixing assembly is arranged through the top of the horizontal section of the bracket assembly. When the locking arm is connected to the floating drum, the fixing assembly is used to fix the position of the locking arm.

[0010] Furthermore, the locking arm is arranged as a variable-diameter arm, and the outer diameter gradually decreases from the locking end to the connection end generally.

[0011] Furthermore, a locking arm backing plate is arranged at the locking end. A bearing housing groove is arranged near the bottom surface of the locking end, and a bearing bush is fixedly connected inside the bearing housing groove; wear-resistant plates are respectively arranged on both sides of the front and rear parts of the locking arm; a mating groove is arranged on the top surface near the connection end, and the mating groove can cooperate with the fixing assembly to fix the position of the locking arm; a pin shaft hole is arranged at the connection end, and a self-lubricating sleeve is arranged inside the pin shaft hole.

[0012] Furthermore, the guiding assembly includes a guiding seat and a guiding column. The guiding column is arranged directly above the guiding seat, and the distance between the guiding column and the guiding seat is used to allow the connection end to pass through.

[0013] Furthermore, the top surface of the guiding seat is arranged as an inclined surface, and the inclined direction faces the locking end, and the inclined angle is set to 8 to 10 degrees.

[0014] Furthermore, the guiding column includes a stud, and a steel pipe is sleeved on the surface of the stud. When the locking assembly moves through the guiding assembly, the steel pipe rolls along the surface of the stud.

[0015] Furthermore, the sliding shoe assembly includes a supporting hinge, the supporting hinge is arranged as a semi-cylindrical shape, baffles are respectively arranged at both ends of the supporting hinge, and the baffles respectively extend out from both ends of the supporting hinge;

[0016] And a sliding shoe backing plate is fixedly connected to the bottom surface of the supporting hinge, a sliding plate is slidably connected to the bottom surface of the sliding shoe backing plate, and the sliding plate is fixedly connected to the ship deck.

[0017] Furthermore, the fixing assembly includes a locking nut fixedly connected to the bracket assembly. A locking screw is rotatably connected inside the locking nut, and a locking cap is fixedly connected to the bottom surface of the locking screw; when the locking screw is rotated downward, the locking cap presses against the locking arm to fix the position of the locking assembly.

[0018] Further, a locking screw protection cap is sleeved on the upper part of the locking nut, and the upper part of the locking screw is sleeved inside the locking screw protection cap; a positioning hole is arranged on the top surface of the locking screw, and a positioning rib is arranged on the bottom surface of the top wall of the locking screw protection cap. The positioning hole and the positioning rib are inserted and matched to prevent the locking screw protection cap from tilting after being sleeved outside the locking screw.

[0019] On the other hand, a method for installing a hydraulic locking device of an FPSO single-point mooring system is provided, which is used for installing the hydraulic locking device of the FPSO single-point mooring system described in any one of the above, and includes the following steps:

[0020] S1. Bolt-fix the guide frame assembly to the ship deck near the moonpool opening;

[0021] S2. Fix the baffle to both ends of the support hinge, fix the sliding shoe backing plate to the bottom surface of the support hinge, fix the sliding plate to the ship deck inside the guide frame assembly, and place the assembled support hinge on the sliding plate;

[0022] S3. The hydraulic cylinder is hinged to the upper side inside the support frame assembly through the first pin shaft; the guide seat and the guide column are bolt-connected to the lower side inside the support frame assembly; the fixing assembly is connected through the support frame assembly;

[0023] S4. Install a locking arm backing plate at the locking end of the locking arm, install wear-resistant plates on both sides of the front and rear parts of the locking arm, install a bearing bush in the bearing bush groove, and install a self-lubricating sleeve in the pin shaft hole at the connecting end;

[0024] S5. Pass the connecting end of the locking arm through the guiding mechanism and hinge it to the telescopic rod of the hydraulic cylinder through the second pin shaft; then, by adjusting the return locking position of the locking arm, weld the support frame assembly to the ship deck.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the hydraulic locking device of the FPSO single-point mooring system and its installation method, the design of the guide frame assembly and the guiding assembly ensures the stability and accuracy of the locking arm during the sliding process, avoiding potential safety hazards caused by shaking or deviation. At the same time, the setting of the fixing assembly further enhances the stability of the device in the locked state.

[0027] 2. In the hydraulic locking device of the FPSO single-point mooring system and its installation method, the design of the sliding shoe assembly allows the locking assembly to slide reciprocally inside the guide frame assembly, which is applicable to pontoons of different sizes and shapes, enhancing the versatility and adaptability of the present device.

[0028] 3. In the hydraulic locking device and its installation method of the FPSO single-point mooring system, the design of the locking nut and the locking screw enables the convenient fixation of the position of the locking arm in the locked state, enhancing safety. Meanwhile, the structural design of this device also takes into account maintainability, facilitating daily maintenance and repair.

[0029] 4. In the hydraulic locking device and its installation method of the FPSO single-point mooring system, the design of the variable-diameter arm increases the strength of the locking arm, improving the locking effect and service life. Additionally, the guide post adopts a combination of double-headed studs and steel pipes, ensuring both the guiding accuracy and cost reduction; and the fixation of the locking arm can be achieved by rotating the locking screw, which is simple and convenient to operate, reducing the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0031] Figure 2 It is a cross-sectional view of the connection and locking state of an embodiment of the present invention;

[0032] Figure 3 It is a cross-sectional view of the release state of an embodiment of the present invention;

[0033] Figure 4 It is a three-dimensional structural diagram of the support assembly of an embodiment of the present invention;

[0034] Figure 5 It is a three-dimensional structural diagram of the locking assembly of an embodiment of the present invention;

[0035] Figure 6 It is a three-dimensional structural diagram of the sliding shoe assembly of an embodiment of the present invention;

[0036] Figure 7 It is a three-dimensional structural diagram of the fixing assembly of an embodiment of the present invention;

[0037] Figure 8 It is a schematic diagram of the internal structure of the fixing assembly of an embodiment of the present invention;

[0038] Figure 9 It is a three-dimensional structural diagram of the guide seat of an embodiment of the present invention;

[0039] Figure 10 It is a three-dimensional structural diagram of the guide post of an embodiment of the present invention;

[0040] Figure 11 It is a schematic diagram of the layout of the hydraulic locking device and the moonpool opening of an embodiment of the present invention;

[0041] Figure 12 It is a schematic diagram of the structure of the guide frame assembly of an embodiment of the present invention.

[0042] Illustration description:

[0043] 1. Guide frame assembly; 11. Cover plate; 12. Side support frame; 13. Self-lubricating plate;

[0044] 2. Bracket assembly; 21. First pin shaft; 22. Hydraulic cylinder; 23. Second pin shaft; 24. Guide seat; 25. Guide post; 26. Steel pipe; 27. Stud; 28. Guide post nut; 29. Guide mechanism; 210. Support frame; 211. Connecting plate;

[0045] 3. Locking assembly; 31. Locking arm backing plate; 32. Locking arm; 33. Bearing bush; 34. Wear-resistant plate; 35. Self-lubricating sleeve; 36. Fitting groove; 37. Bearing bush groove; 38. Locking end; 39. Connection end;

[0046] 4. Shoe assembly; 41. Support hinge; 42. Baffle; 43. Shoe backing plate; 44. Slide plate;

[0047] 5. Fixing assembly; 51. Locking screw protection cap; 52. Locking screw; 53. Locking cap; 54. Locking nut;

[0048] 6. Moonpool opening; 61. Buoy. Detailed implementation mode

[0049] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation mode, structure, features and their effects of the present invention as follows.

[0050] Embodiment 1: Please refer to Figures 1-12 As shown in the figure, the purpose of this embodiment is to provide a hydraulic locking device for the single-point mooring system of an FPSO, including a guide frame assembly 1 fixedly connected to the surface of the ship deck around the moonpool opening 6. A shoe assembly 4 is slidably arranged in the guide frame assembly 1. The top surface of the shoe assembly 4 is hinged with a locking assembly 3. The shoe assembly 4 drives the locking assembly 3 to reciprocate along the guide frame assembly 1;

[0051] In this embodiment, the guide frame assembly 1 includes side support frames 12 on both the left and right sides. Self-lubricating plates 13 are respectively connected to the inner walls of the two side support frames 12 by countersunk head screws, and the top surfaces are respectively bolted to both ends of the cover plate 11. The cover plate 11 connects the side support frames 12 on both sides into a whole, that is, the guide frame assembly 1. A guide channel is formed in the middle of the guide frame assembly 1 to limit the moving direction of the locking assembly 3. The self-lubricating plates 13 can reduce the frictional resistance between the locking assembly 3 and the side support frames 12. Further, in order to increase the strength of the side support frames 12, two longitudinal rib plates are perpendicularly welded to the outer side walls of the side support frames 12, and connecting rib plates are welded between the longitudinal rib plates and the outer sides of the side support frames 12. The guide channel faces the moon pool opening 6, and the guide frame assembly 1 is placed on the ship deck plane and fixed with bolts.

[0052] Among them, the locking assembly 3 includes a locking arm 32. The end of the locking arm 32 that cooperates with the floating drum 61 is set as a locking end 38, and the other end of the locking assembly 3 is set as a connection end 39. The connection end 39 is hinged to the bracket assembly 2.

[0053] The bracket assembly 2 is set as an L-shaped structure. A hydraulic cylinder 22 is hinged downward at the top inside the L-shaped structure. The end of the telescopic rod of the hydraulic cylinder 22 is hinged to the connection end 39 of the locking arm 32.

[0054] In this embodiment, the bracket assembly 2 is an L-shaped frame formed by welding two L-shaped support frames 210 through a connecting plate 211. A first pin shaft 21 is connected through the top of the vertical section of the L-shaped frame. The hydraulic cylinder 22 is hinged to the first pin shaft 21, and the hydraulic cylinder 22 extends from the hinged end into the bracket assembly 2. A second pin shaft 23 is penetrated through the end of the telescopic rod of the hydraulic cylinder 22, and the second pin shaft 23 is hinged and connected to the connection end 39. The locking assembly 3 is driven to move by the telescopic rod of the hydraulic cylinder 22.

[0055] A guide assembly 29 is arranged inside the horizontal section of the L-shaped frame of the bracket assembly 2. The guide assembly 29 includes a guide seat 24 and a guide post 25. The guide post 25 is arranged directly above the guide seat 24. The distance between the guide post 25 and the guide seat 24 just allows the connection end 39 to pass between the two. The guide assembly 29 supports and guides the movement of the connection end 39 of the locking arm 32.

[0056] Both sides of the guide seat 24 are fixedly connected to the inner wall of the support frame 210 by bolts. The top surface of the guide seat 24 is set as an inclined surface, and the inclined direction is towards the locking end 38. The inclined angle is set to 8 to 10 degrees. The setting of the inclined surface reduces the frictional resistance between the locking assembly 3 and the guide seat 24.

[0057] A guide assembly 29 is arranged inside the horizontal section of the bracket assembly 2. The guide assembly 29 supports and guides the movement of the locking arm 32.

[0058] A fixing assembly 5 is penetrated through the top of the horizontal section of the support assembly 2. When the locking arm 32 is connected to the floating drum 61, the fixing assembly 5 is used to fix the position of the locking arm 32. After the fixing assembly 5 locks the position of the locking arm 32, the pressure of the hydraulic cylinder 22 can be withdrawn, avoiding problems such as oil leakage caused by the long-term pressure maintenance of the hydraulic cylinder 22, which affects the connection between the hull and the mooring system.

[0059] The fixing assembly 5 includes a locking nut 54 fixedly connected to the support assembly 2. A locking screw 52 is rotatably connected inside the locking nut 54. A locking cap 53 is fixedly connected to the bottom surface of the locking screw 52. Rotating the locking screw 52 downward, the locking cap 53 presses against the locking arm 32 to fix the position of the locking assembly 3.

[0060] A locking screw protection cap 51 is sleeved on the upper part of the locking nut 54. The upper part of the locking screw 52 is sleeved inside the locking screw protection cap 51. A positioning hole is provided on the top surface of the locking screw 52, and a positioning rib is provided on the bottom surface of the top wall of the locking screw protection cap 51. The positioning hole and the positioning rib are inserted and matched to prevent the locking screw protection cap 51 from tilting after being sleeved on the outside of the locking screw 52. Further, the hydraulic locking device is controlled by an independent hydraulic power unit HPU.

[0061] Among them, the locking arm 32 is set as a variable-diameter arm, and the outer diameter generally gradually decreases from the locking end 38 to the connecting end 39, increasing the strength and locking force of the locking arm 32.

[0062] Among them, a locking arm backing plate 31 is provided at the locking end 38. A bearing housing groove 37 is provided near the bottom surface of the locking end 38. A bearing 33 is fixedly connected inside the bearing housing groove 37. And the bearing housing groove 37 is buckled on the semi-cylindrical surface of the support hinge 41 and is hinged to the support hinge 41. When the locking arm 32 is locked with the floating drum 61, the angle of the locking end 38 is adjusted according to the height of the floating drum 61.

[0063] In this embodiment, wear-resistant plates 34 are respectively provided on both sides of the front and rear parts of the locking arm 32. A mating groove 36 is provided on the top surface near the connecting end 39. The mating groove 36 can cooperate with the fixing assembly 5 to fix the position of the locking arm 32. A pin hole is provided at the connecting end 39, and a self-lubricating sleeve 35 is provided inside the pin hole.

[0064] The guide post 25 includes a double-headed stud 27. A steel pipe 26 is sleeved on the surface of the double-headed stud 27. Both ends of the double-headed stud 27 penetrate through the two sides of the support frame 210 and are locked with nuts on the outside of the support frame 210. When the locking assembly 3 moves through the guide assembly 29, the steel pipe 26 rolls along the surface of the double-headed stud 27, which is used to reduce the frictional resistance between the locking assembly 3 and the guide post 25.

[0065] In this embodiment, the sliding shoe assembly 4 includes a support hinge 41, which is arranged in a semi-cylindrical shape. Baffles 42 are respectively arranged at both ends of the support hinge 41, and the baffles 42 respectively extend out from both ends of the support hinge 41;

[0066] Moreover, a sliding shoe backing plate 43 is fixedly connected to the bottom surface of the support hinge 41, a sliding plate 44 is slidably connected to the bottom surface of the sliding shoe backing plate 43, the sliding plate 44 is fixedly connected to the ship deck, the sliding shoe assembly 4 is placed on the sliding plate 44, and can reciprocally slide on the sliding plate 44.

[0067] A locking assembly 3 is hinged to the semi-cylindrical surface of the support hinge 41, and the sliding shoe assembly 4 drives the locking assembly 3 to reciprocally slide along the guiding channel.

[0068] The working process of this device is as follows:

[0069] Floating buoy reconnecting stage: Refer to Figure 2 , driven by the hydraulic power unit HPU, the hydraulic cylinder pushes the locking arm to move towards the locking position on the upper ring of the floating buoy. The locking arm contacts and locks with the upper ring of the floating buoy. After the seawater in the single-point tank is emptied, the locking arm is locked and fixed mechanically with a locking screw, and then the hydraulic system is depressurized.

[0070] Floating buoy releasing stage: Refer to Figure 3 , the hydraulic power unit HPU is started. After the pressure in the hydraulic system reaches the specified value, the locking screw is loosened, and the fixing method of the locking arm is changed from mechanical fixing to hydraulic fixing. After the hull winch lifts the floating buoy upwards to the specified load, the hydraulic power unit HPU drives the hydraulic cylinder to drag the locking arm to disengage from the floating buoy.

[0071] Embodiment 2: The present invention provides an installation method for a hydraulic locking device of an FPSO single-point mooring system, which is used to install the above-mentioned hydraulic locking device of the FPSO single-point mooring system, and includes the following steps:

[0072] S1. Bolt-fix the side support frames 12 on both sides and the top cover plate 11 of the guiding frame assembly 1. A self-lubricating plate 13 is installed inside the side support frame 12, and the self-lubricating plate 13 reduces the wear of the guiding frame assembly 1; then bolt-fix the guiding frame assembly 1 to the ship deck near the moonpool opening 6;

[0073] S2. Fix the baffles 42 at both ends of the support hinge 41, fix the sliding shoe backing plate 43 to the bottom surface of the support hinge 41, fix the sliding plate 44 to the ship deck inside the guiding frame assembly 1, and place the assembled support hinge 41 on the sliding plate 44;

[0074] S3. The hydraulic cylinder 22 is hinged to the upper side inside the bracket assembly 2 through a first pin shaft 21; bolt-connect the guiding seat 24 and the guiding column 25 to the lower side inside the bracket assembly 2; the fixing assembly 5 is connected through the bracket assembly 2;

[0075] S4. Install the locking arm backing plate 31 at the locking end 38 of the locking arm 32, install wear-resistant plates 34 on both sides of the front and rear parts of the locking arm 32, install the bearing bush 33 in the bearing bush groove 37, and install the self-lubricating sleeve 35 in the pin hole of the connecting end 39;

[0076] S5. Pass the connecting end 39 of the locking arm 32 through the guiding mechanism 29 and hinge it to the telescopic rod of the hydraulic cylinder 22 through the second pin 23; then, by adjusting the return locking position of the locking arm 32, weld the support assembly 2 to the ship deck.

[0077] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the technical content disclosed above without departing from the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A hydraulic locking device for an FPSO single point mooring system, comprising a guide frame assembly (1) fixedly connected to the surface of the ship deck around the moon pool opening (6), characterized in that, A sliding shoe assembly (4) is slidably arranged inside the guide frame assembly (1). A locking assembly (3) is hinged to the top surface of the sliding shoe assembly (4). The sliding shoe assembly (4) drives the locking assembly (3) to reciprocate along the guide frame assembly (1). Wherein, the locking assembly (3) includes a locking arm (32). The end of the locking arm (32) that cooperates with the floating drum (61) is set as a locking end (38). The other end of the locking assembly (3) is set as a connection end (39). The connection end (39) is hinged to the bracket assembly (2). The bracket assembly (2) is set as an L-shaped structure. A hydraulic cylinder (22) is hinged downward at the top end inside the L-shaped structure. The end of the telescopic rod of the hydraulic cylinder (22) is hinged to the connection end (39) of the locking arm (32). A guiding assembly (29) is arranged inside the horizontal section of the bracket assembly (2). The guiding assembly (29) supports and guides the movement of the locking arm (32). A fixing assembly (5) penetrates through the top of the horizontal section of the bracket assembly (2). When the locking arm (32) is connected to the floating drum (61), the fixing assembly (5) is used to fix the position of the locking arm (32).

2. The hydraulic locking device of the FPSO single-point mooring system according to claim 1, characterized in that, The locking arm (32) is set as a variable-diameter arm, and the outer diameter generally gradually decreases from the locking end (38) to the connection end (39).

3. The hydraulic locking device of the FPSO single point mooring system according to claim 1, characterized in that The locking end (38) is provided with a locking arm backing plate (31). A bearing bush groove (37) is arranged near the bottom surface of the locking end (38). A bearing bush (33) is fixedly connected inside the bearing bush groove (37). Wear-resistant plates (34) are respectively arranged on both sides of the front and rear parts of the locking arm (32). A mating groove (36) is arranged near the top surface of the connection end (39). The mating groove (36) can cooperate with the fixing assembly (5) to fix the position of the locking arm (32). A pin shaft hole is arranged at the connection end (39), and a self-lubricating sleeve (35) is arranged inside the pin shaft hole.

4. The hydraulic locking device of the FPSO single-point mooring system according to claim 1, characterized in that The guiding assembly (29) includes a guiding seat (24) and a guiding column (25). The guiding column (25) is arranged directly above the guiding seat (24), and the distance between the guiding column (25) and the guiding seat (24) is used to allow the connection end (39) to pass through.

5. The hydraulic locking device of the FPSO single-point mooring system according to claim 4, characterized in that The top surface of the guiding seat (24) is set as an inclined surface, and the inclined direction faces the locking end (38), and the inclined angle is set to 8 to 10 degrees.

6. The hydraulic locking device of the FPSO single-point mooring system according to claim 4, characterized in that, The guiding column (25) includes a stud (27). A steel pipe (26) is sleeved on the surface of the stud (27). When the locking assembly (3) moves through the guiding assembly (29), the steel pipe (26) rolls along the surface of the stud (27).

7. The hydraulic locking device of the FPSO single point mooring system according to claim 1, characterized in that The sliding shoe assembly (4) includes a support hinge (41). The support hinge (41) is set as a semi-cylindrical shape. Baffles (42) are respectively arranged at both ends of the support hinge (41), and the baffles (42) respectively extend out from both ends of the support hinge (41). And a sliding shoe backing plate (43) is fixedly connected to the bottom surface of the support hinge (41). The bottom surface of the sliding shoe backing plate (43) is slidably connected to a sliding plate (44), and the sliding plate (44) is fixedly connected to the ship deck.

8. The hydraulic locking device of the FPSO single-point mooring system according to claim 1, characterized in that, The fixed component (5) includes a lock nut (54) fixedly connected to the bracket component (2). A lock screw (52) is rotatably connected inside the lock nut (54). The bottom surface of the lock screw (52) is fixedly connected with a lock cap (53). Rotate the lock screw (52) downward, and the lock cap (53) presses against the lock arm (32) to fix the position of the locking component (3).

9. The hydraulic locking device of the FPSO single-point mooring system according to claim 8, characterized in that, A lock screw protection cap (51) is sleeved on the upper part of the lock nut (54), and the upper part of the lock screw (52) is sleeved inside the lock screw protection cap (51). A positioning hole is provided on the top surface of the lock screw (52), and a positioning rib is provided on the bottom surface of the top wall of the lock screw protection cap (51). The positioning hole and the positioning rib are inserted and matched to prevent the lock screw protection cap (51) from tilting after being sleeved on the outside of the lock screw (52).

10. A method for installing a hydraulic locking device of an FPSO single-point mooring system, which is used to install the hydraulic locking device of the FPSO single-point mooring system as described in claims 1-9, characterized in that, It includes the following steps: S1. Bolt-fix the guide frame component (1) to the ship deck near the moon pool opening (6). S2. Fix the baffle (42) at both ends of the support hinge (41), fix the sliding shoe backing plate (43) at the bottom surface of the support hinge (41), fix the sliding plate (44) on the ship deck inside the guide frame component (1), and place the assembled support hinge (41) on the sliding plate (44). S3. The hydraulic cylinder (22) is hinged to the upper side inside the bracket component (2) through the first pin shaft (21). Bolt-connect the guide seat (24) and the guide column (25) to the lower side inside the bracket component (2). The fixed component (5) is connected through the bracket component (2). S4. Install a lock arm backing plate (31) at the locking end (38) of the lock arm (32), install wear-resistant plates (34) on both sides of the front and rear parts of the lock arm (32), install a bearing bush (33) in the bearing bush groove (37), and install a self-lubricating sleeve (35) in the pin shaft hole of the connecting end (39). S5. Pass the connecting end (39) of the lock arm (32) through the guiding mechanism (29) and hinge it to the telescopic rod of the hydraulic cylinder (22) through the second pin shaft (23). Then, by adjusting the return locking position of the lock arm (32), weld the bracket component (2) to the ship deck.

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