A subsea cable joint sealing arrangement

Abstract

The application provides a submarine cable joint sealing structure and relates to the technical field of submarine cable installation. The structure comprises a bottom frame, two moving plates symmetrically and slidingly installed on the surface of the bottom frame, a connecting plate arranged on the outer side of the moving plates, an intermediate plate fixed at the middle position of the bottom frame, a sealing assembly arranged at the top of the moving plate, a connecting frame, a sealing frame fixed at the tail end of the connecting frame, a traction assembly arranged at the top of the connecting plate, a fixed frame, two clamping frames symmetrically arranged in the fixed frame, and the bottom frame is fixed to the seabed, two groups of sealing assemblies wrap and seal the butt joint end of the cable body, the traction assembly can avoid the traction influence of seabed movement on the submarine cable, the sealing assembly enhances the sealing property, and the sealing assembly is convenient for butt joint installation with the submarine cable joint and subsequent disassembly and maintenance.

Description

Technical Field

[0001] This invention relates to the field of submarine cable installation technology, specifically to a submarine cable joint sealing structure. Background Technology

[0002] Submarine cables are cables wrapped in insulating materials and laid on the seabed for telecommunications transmission. Submarine cables are divided into submarine communication cables and submarine power cables. When laying submarine cables, a special joint structure is required to seal the cable joints.

[0003] Existing composite cables mainly use armored structures for protection, with injection molding forming a sheath at the taps to achieve waterproofing and protection during transportation and installation. However, due to water currents and geological activities on the seabed, submarine cables are prone to swaying. Conventional sealing methods are more susceptible to wear and tear under swaying, and are also more likely to cause leaks. In addition, conventional sealing methods are inconvenient for disassembly and maintenance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a sealing structure for submarine cable joints to solve the problems mentioned in the background. The present invention has a novel structure, which is fixed to the seabed by a bottom frame, and two sets of sealing components wrap and seal the cable body's docking end. The traction component can avoid the traction effect on the submarine cable caused by seabed movement, and the sealing component enhances the sealing performance. At the same time, it facilitates the docking and installation of the sealing component and the submarine cable joint, as well as subsequent disassembly and maintenance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealing structure for a submarine cable joint, comprising a base frame, two movable plates symmetrically slidably mounted on the surface of the base frame, a connecting plate located outside the movable plates on the base frame, a middle plate fixed in the middle of the base frame, a sealing assembly on the top of the movable plates, the sealing assembly including a connecting frame, a sealing frame fixed at the tail end of the connecting frame, a traction assembly on the top of the connecting plate, the traction assembly including a fixed frame, two clamping frames symmetrically arranged inside the fixed frame, the cable body passing through the clamping frames, and the other end of the cable body... The end of the cable passes through the sealing frame and the connecting frame. Locking bolts are locked into the outer sides of the two connecting frames. An inflation assembly is provided inside the sealing frame and the connecting frame. The inflation assembly includes a sealing layer. The sealing layer is fixed inside the sealing frame. A second airbag is fixed to one end of the outer side of the sealing frame. A first airbag is fixed inside the connecting frame. The cable body passes through the second airbag, the sealing groove and the first airbag. Fixed cones are slidably inserted into the two sides of the bottom frame. A vertical plate is fixed to the bottom of the sealing frame. A sliding frame is fixed to the top of the moving plate. The vertical plate slides along the inside of the sliding frame. Two air chambers are provided inside the vertical plate.

[0006] Furthermore, the traction assembly also includes an insert plate, the bottom of the fixing frame is fixed with the insert plate, the top of the connecting plate is fixed with the insert frame, and the insert plate is slidably inserted into the insert frame. The outer end of the insert frame is threaded with a fixing bolt, and the fixing bolt is in contact with the insert plate by compression.

[0007] Furthermore, a telescopic plate is fixed to the top of the movable plate, and a sleeve frame is fixed to the extended end of the telescopic plate. The sleeve frame wraps around the surface of the cable body. Connecting rods are rotatably connected to both sides of the fixed frame via a pivot, and the other end of the connecting rod is rotatably connected to the sleeve frame via a pivot.

[0008] Furthermore, adjusting screws are threaded into both sides of the fixed frame, and the inner ends of the adjusting screws are rotatably connected to the clamping frame through bearings.

[0009] Furthermore, a bidirectional screw is rotatably mounted inside the bottom frame via a bearing, and two movable plates are threaded onto the surface of the bidirectional screw. The connecting plate is slidably fitted onto both ends of the bidirectional screw. Two insert rods are slidably inserted inside the movable plate, and the other end of the insert rods is fixedly connected to the connecting plate. A first spring is fixed between the insert rods and the inside of the movable plate, and a sealing ring is fixed to the outer end of the movable plate corresponding to the insert rods protruding from it.

[0010] Furthermore, the sealing assembly also includes side plates, with side plates fixed to the bottom of both sides of the mating end of the connecting frame, a card plate fixed to the top of the fixing cone, and card slots opened on both sides of the top of the card plate. A card block is fixed to the side of the side plate facing the card slot, and the card block is slidably inserted into the card slot.

[0011] Furthermore, a rotating plate is rotatably mounted on the top of the intermediate plate via a rotating shaft, and protruding plates are slidably inserted into both ends of the rotating plate. A limiting groove is provided at the outer end of the protruding plate, and a vertical rod is rotatably mounted on the bottom of the connecting frame corresponding to the limiting groove via a bearing, with the bottom of the vertical rod inserted into the limiting groove.

[0012] Furthermore, the inflation assembly also includes a piston rod, with the piston rod slidably inserted into the outer side of the two air chambers of the vertical plate, and the piston rod facing the middle side. An air tube is fixed to the other side of the two air chambers of the vertical plate, and the air tube passes through the first airbag and the second airbag.

[0013] Furthermore, a second spring is sleeved on the outer end of the piston rod, and the other end of the second spring is fixedly connected to the vertical plate.

[0014] Furthermore, pushers are fixed on both sides of the intermediate plate at positions corresponding to the outer ends of the piston rod, and the pushers are in contact with the piston rod by pressing.

[0015] The beneficial effects of this invention are:

[0016] The cable body of the present invention is installed by the rotation clamping of the clamping block and the adjusting screw. The sleeve is wrapped around the cable body. By the pushing of the connecting rod and the support and limiting of the telescopic plate, the excess length of the cable body is bent and arranged to avoid the subsequent cable body being pulled.

[0017] In addition to the cable body connected inside the sealing assembly, when the cable sways due to the traction of the seabed environment or water current, the fixed frame moves in coordination with the bent cable body, thereby avoiding direct traction on the cable joint inside the sealing assembly. The sealing assembly and the traction assembly are installed on the moving plate and the connecting plate. By rotating the bidirectional screw, the two connecting frames can be connected to complete the connection of the cable body. The connecting plate is kept at a certain distance from the moving plate by the plug rod and the first spring, so that the traction assembly can bend part of the cable body for cushioning when the submarine cable sways.

[0018] In this invention, when the connecting frames are joined, the side plate's locking block is inserted into the locking slot of the locking plate. The cooperation between the locking block and the locking slot enhances the connection stability between the connecting frame and the bottom frame. At the same time, the locking slot allows the locking block to slide on both sides, facilitating the rotation of the rotating plate. Because the vertical rod is inserted into the limiting groove, the two sets of connecting frames are moved in two directions, and the joined parts are staggered and unfolded, which facilitates internal inspection or cleaning of corroded internal parts. When the connecting frames move, the vertical plate slides along the sliding frame, and the protruding plate slides through both ends of the rotating plate, maintaining the limiting connection with the vertical rod.

[0019] In this invention, when the two sets of sealing components move and connect along the bottom frame with the bidirectional screw, the piston rod gradually approaches the pusher, thereby filling the first and second air bladders with gas from the vertical plate air chamber through the air pipe. The first and second air bladders expand and, together with the sealing layer, wrap around the surface of the cable body, thereby enhancing the sealing performance of the entire sealing component. The enhancement of sealing performance is completed simultaneously during the connection and installation.

[0020] Compared with the prior art, this invention uses a bottom frame fixed to the seabed, two sets of sealing components to wrap and seal the cable body's docking end, a traction component to avoid the traction effect of seabed movement on the submarine cable, and sealing components to enhance the sealing performance. At the same time, it facilitates the docking and installation of the sealing components and the submarine cable joint, as well as subsequent disassembly and maintenance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a submarine cable joint sealing structure according to the present invention;

[0022] Figure 2 This is a schematic diagram of the bottom structure of the bottom frame of a submarine cable joint sealing structure according to the present invention;

[0023] Figure 3 This is a schematic diagram showing the connection between the traction assembly and the sealing assembly of a submarine cable joint sealing structure according to the present invention;

[0024] Figure 4 This is a schematic diagram of the traction assembly structure of a submarine cable joint sealing structure according to the present invention;

[0025] Figure 5 This is a schematic diagram of the inflatable component structure of a submarine cable joint sealing structure according to the present invention;

[0026] Figure 6 This is a schematic diagram of the connection frame and the fixed cone snapping together in a sealing structure for a submarine cable joint according to the present invention;

[0027] Figure 7 This is a schematic diagram showing the connection between the pusher and piston rod in a sealing structure for a submarine cable joint according to the present invention;

[0028] Figure 8 This is a schematic diagram of the top structure of the intermediate plate of a submarine cable joint sealing structure according to the present invention.

[0029] In the diagram: 1. Base frame; 11. Fixed cone; 12. Bidirectional screw; 13. Moving plate; 14. Connecting plate; 15. Intermediate plate; 16. Insert rod; 17. First spring; 18. Sealing ring; 19. Clamping plate; 110. Clamping groove; 111. Rotating plate; 112. Extending plate; 113. Limiting groove; 114. Push frame; 2. Sealing assembly; 21. Connecting frame; 22. Locking bolt; 23. Sealing frame; 24. Vertical plate; 25. 26. Sliding frame; 27. Side plate; 28. Locking block; 3. Vertical rod; 4. Cable body; 5. Inflatable assembly; 41. First airbag; 42. Sealing layer; 43. Second airbag; 44. Air tube; 45. Piston rod; 46. Second spring; 5. Traction assembly; 51. Fixed frame; 52. Connecting rod; 53. Telescopic plate; 54. Sleeve frame; 55. Clamping frame; 56. Adjusting screw; 57. Insert plate; 58. Insert frame; 59. Fixing bolt. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Please see Figures 1 to 8This invention provides a technical solution: a sealing structure for a submarine cable joint, comprising a base frame 1, on which two movable plates 13 are symmetrically slidably mounted, and a connecting plate 14 is provided on the outer side of the base frame 1 and the movable plates 13. A middle plate 15 is fixed in the middle of the base frame 1. A sealing assembly 2 is provided on the top of the movable plates 13. The sealing assembly 2 includes a connecting frame 21, and a sealing frame 23 is fixed at the tail end of the connecting frame 21. A traction assembly 5 is provided on the top of the connecting plate 14. The traction assembly 5 includes a fixed frame 51, and two clamping frames 55 are symmetrically arranged inside the fixed frame 51. A cable body 3 passes through the clamping frames 55, and the other end of the cable body 3 passes through the sealing frame 23 and the connecting frame 21. Locking bolts 22 are locked into the outer sides of the two connecting frames 21. An inflation assembly 4 is provided inside the sealing frame 23 and the connecting frame 21. The device includes a sealing layer 42, which is fixed inside the sealing frame 23. A second airbag 43 is fixed to one end of the outer side of the sealing frame 23. A first airbag 41 is fixed inside the connecting frame 21. The cable body 3 passes through the second airbag 43, the sealing groove, and the first airbag 41. Fixed cones 11 are slidably inserted into the two sides of the bottom frame 1. A vertical plate 24 is fixed to the bottom of the sealing frame 23. A sliding frame 25 is fixed to the top of the moving plate 13. The vertical plate 24 slides along the inside of the sliding frame 25. The vertical plate 24 has two air chambers inside. When using the device, the two sections of the cable body 3 are passed through the traction component 5 and the sealing component 2 and installed on the bottom frame 1. The sealing component 2 slides along the bottom frame 1 and is connected in the middle position. Then, the sealing component 2 strengthens the sealing inside the sealing component 2. The traction component 5 is used to prevent the cable body 3 from being pulled, which could cause the connector to break or the sealing to deteriorate.

[0032] In this embodiment, the traction assembly 5 further includes a plug plate 57. The plug plate 57 is fixed to the bottom of the fixing frame 51, and a plug frame 58 is fixed to the top of the connecting plate 14. The plug plate 57 is slidably inserted into the plug frame 58. A fixing bolt 59 is threaded into the outer end of the plug frame 58, and the fixing bolt 59 is in pressing contact with the plug plate 57. A telescopic plate 53 is fixed to the top of the moving plate 13, and a sleeve frame 54 is fixed to the extended end of the telescopic plate 53. The sleeve frame 54 wraps around the surface of the cable body 3. The fixing frame 51... The two sides are rotatably connected by a pivot, and the other end of the pivot is rotatably connected to the sleeve frame 54. The two sides of the fixed frame 51 are threaded with adjusting screws 56, and the inner end of the adjusting screws 56 is rotatably connected to the clamping frame 55 through a bearing. The cable body 3 is clamped and installed by the rotation of the clamping block and the adjusting screws 56. The sleeve frame 54 is wrapped around the cable body 3. By pushing the pivot 52 and supporting and limiting the telescopic plate 53, the excess length of the cable body 3 is bent and arranged to avoid the subsequent cable body 3 being pulled.

[0033] In this embodiment, a bidirectional screw 12 is rotatably mounted inside the bottom frame 1 via bearings. Two movable plates 13 are threaded onto the surface of the bidirectional screw 12. A connecting plate 14 is slidably sleeved on both ends of the bidirectional screw 12. Two insert rods 16 are slidably inserted inside the movable plate 13, and the other end of the insert rod 16 is fixedly connected to the connecting plate 14. A first spring 17 is fixed between the insert rod 16 and the interior of the movable plate 13. A sealing ring 18 is fixed to the outer end of the movable plate 13 corresponding to the insert rod 16. Except for the cable body 3 connected inside the sealing assembly 2... In addition, when the cable sways due to the traction of the seabed environment or water current, the fixed frame 51 moves in coordination with the bent cable body 3, thereby avoiding direct traction on the cable joint inside the sealing component 2. The sealing component 2 and the traction component 5 are installed on the moving plate 13 and the connecting plate 14. By rotating the bidirectional screw 12, the two connecting frames 21 can be connected to complete the connection of the cable body 3. The connecting plate 14 is kept at a certain distance from the moving plate 13 by the insert rod 16 and the first spring 17, so that the traction component 5 can bend part of the cable body 3 for cushioning when the submarine cable sways.

[0034] In this embodiment, the sealing assembly 2 further includes a side plate 26. Side plates 26 are fixed to the bottom of both sides of the mating end of the connecting frame 21. A retaining plate 19 is fixed to the top of the fixing cone 11, and retaining slots 110 are provided on both sides of the top of the retaining plate 19. A retaining block 27 is fixed to the side of the side plate 26 facing the retaining slot 110, and the retaining block 27 is slidably inserted into the retaining slot 110. A rotating plate 111 is rotatably mounted on the top of the intermediate plate 15 via a rotating shaft, and extension plates 112 are slidably inserted into both ends of the rotating plate 111. A limiting groove 113 is provided at the outer end of the extension plate 112. A vertical rod 28 is rotatably mounted on the bottom of the connecting frame 21 corresponding to the limiting groove 113 via a bearing, and the bottom of the vertical rod 28 is inserted into... Inside the limiting groove 113, when the connecting frame 21 is docked, the locking block 27 of the side plate 26 is inserted into the locking groove 110 of the locking plate 19. The cooperation between the locking block 27 and the locking groove 110 strengthens the connection stability between the connecting frame 21 and the bottom frame 1. At the same time, the locking groove 110 allows the locking block 27 to slide on both sides, which is convenient for rotation by the rotating plate 111. Because the vertical rod 28 is inserted into the limiting groove 113, the two sets of connecting frames 21 are moved in two directions, and the docked parts are staggered and unfolded, which is convenient for internal inspection or cleaning of the corroded interior. When the connecting frame 21 moves, the vertical plate 24 slides along the sliding frame 25, and the protruding plate 112 slides out along both ends of the rotating plate 111, maintaining the limiting connection with the vertical rod 28.

[0035] In this embodiment, the inflation assembly 4 further includes a piston rod 45. The piston rod 45 is slidably inserted into the outer side of the two air chambers of the vertical plate 24, with the piston rod 45 facing towards the middle side. An air tube 44 is fixed to the other side of the two air chambers of the vertical plate 24. The air tube 44 passes through the first airbag 41 and the second airbag 43. A second spring 46 is sleeved on the outer end of the piston rod 45, and the other end of the second spring 46 is fixedly connected to the vertical plate 24. The two sides of the middle plate 15 are fixed with positions corresponding to the outer ends of the piston rod 45. The pusher 114 is pressed into contact with the piston rod 45. When the two sets of sealing components 2 move and dock along the bottom frame 1 with the bidirectional screw 12, the piston rod 45 gradually moves closer to the pusher 114, thereby filling the gas in the air chamber of the vertical plate 24 into the first airbag 41 and the second airbag 43 through the air pipe 44. The first airbag 41 and the second airbag 43 expand, and together with the sealing layer 42, they wrap around the surface of the cable body 3, thereby strengthening the sealing performance of the entire sealing component 2. The sealing performance is strengthened simultaneously during docking and installation.

[0036] When using the device, the two cable bodies 3 are passed through the traction assembly 5 and the sealing assembly 2 and installed on the base frame 1. The cable bodies 3 are clamped and installed by the rotation of the clamping block and the adjusting screw 56. The sleeve frame 54 is wrapped around the cable bodies 3. By pushing the connecting rod 52 and supporting and limiting the telescopic plate 53, the excess length of the cable body 3 is bent and arranged to avoid subsequent cable bodies 3 being pulled. When the connecting frame 21 is connected, the locking block 27 of the side plate 26 is inserted into the locking groove 110 of the locking plate 19. The locking block 27 and the locking groove 110 are matched. The connection stability between the connecting frame 21 and the bottom frame 1 is enhanced. Simultaneously, the slot 110 allows the locking block 27 to slide left and right, facilitating rotation via the rotating plate 111. Because the vertical rod 28 is inserted into the limiting slot 113, the two sets of connecting frames 21 are moved in two directions, misaligning and unfolding the mating parts, facilitating internal inspection or cleaning of corroded interiors. When the connecting frame 21 moves, the vertical plate 24 slides along the sliding frame 25, and the protruding plate 112 slides through both ends of the rotating plate 111, maintaining the limiting connection with the vertical rod 28. As the two sets of sealing components 2 move and connect along the bottom frame 1 with the bidirectional screw 12, the piston rod 45 gradually approaches the push frame 114, thereby filling the gas in the air chamber of the vertical plate 24 into the first airbag 41 and the second airbag 43 through the air pipe 44. The first airbag 41 and the second airbag 43 expand, and together with the sealing layer 42, they wrap around the surface of the cable body 3, thereby strengthening the sealing performance of the entire sealing component 2. The sealing performance is strengthened simultaneously during the docking installation. In addition to the cable body 3 connected inside the sealing component 2, when the cable sways due to the traction of the seabed environment or water current, the fixed frame 51 moves in coordination with the bent cable body 3, thereby avoiding direct traction on the cable joint inside the sealing component 2. The sealing component 2 and the traction component 5 are installed on the moving plate 13 and the connecting plate 14. By rotating the bidirectional screw 12, the two connecting frames 21 can dock to complete the connection of the cable body 3. The connecting plate 14 is kept at a certain distance from the moving plate 13 by the insert rod 16 and the first spring 17, so that the traction component 5 can bend part of the cable body 3 for cushioning when the submarine cable sways.

[0037] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A subsea cable joint sealing arrangement comprising a base frame (1), characterised in that: Two moving plates (13) are symmetrically and slidably installed on the surface of the bottom frame (1), and a connecting plate (14) is arranged outside the moving plate (13), an intermediate plate (15) is fixed at the middle position of the bottom frame (1), a sealing assembly (2) is arranged at the top of the moving plate (13), the sealing assembly (2) comprises a connecting frame (21), a sealing frame (23) is fixed at the tail end of the connecting frame (21), a traction assembly (5) is arranged at the top of the connecting plate (14), the traction assembly (5) comprises a fixed frame (51), two clamping frames (55) are symmetrically arranged inside the fixed frame (51), the cable body (3) penetrates through the clamping frame (55), the other end of the cable body (3) penetrates into the inside of the sealing frame (23) and the connecting frame (21), locking bolts (22) are locked and inserted at the outer sides of the two connecting frames (21), an inflation assembly (4) is arranged inside the sealing frame (23) and the connecting frame (21), the inflation assembly (4) comprises a sealing layer (42), the sealing layer (42) is fixed inside the sealing frame (23), one end of the sealing frame (23) outside is fixed with a second air bag (43), a first air bag (41) is fixed inside the connecting frame (21), the cable body (3) penetrates through the second air bag (43), the sealing groove and the first air bag (41), fixed cones (11) are slidably inserted at the two side edges of the bottom frame (1), a vertical plate (24) is fixed at the bottom of the sealing frame (23), a sliding frame (25) is fixed at the top of the moving plate (13), and the vertical plate (24) slides along the inside of the sliding frame (25), two air cavities are arranged inside the vertical plate (24).

2. A subsea cable joint sealing arrangement according to claim 1, characterised in that: The traction assembly (5) further comprises an insertion plate (57), the insertion plate (57) is fixed at the bottom of the fixed frame (51), an insertion frame (58) is fixed at the top of the connecting plate (14), and the insertion plate (57) is slidably inserted into the inside of the insertion frame (58), a fixed bolt (59) is threadedly inserted at the outer end of the insertion frame (58), and the fixed bolt (59) is in extrusion contact with the insertion plate (57).

3. A subsea cable joint sealing arrangement according to claim 2, characterised in that: The top of the moving plate (13) is fixed with an expansion plate (53), and the elongated end of the expansion plate (53) is fixed with a sleeve frame (54), the sleeve frame (54) is wrapped on the surface of the cable body (3), and the two sides of the fixed frame (51) are rotatably connected with connecting rods (52) through shafts, and the other end of the connecting rod (52) is rotatably connected with the sleeve frame (54) through a shaft.

4. A subsea cable joint sealing arrangement according to claim 3, characterised in that: The two sides of the fixed frame (51) are threadedly inserted with adjusting screws (56), and the inner end of the adjusting screw (56) is rotatably connected with the clamping frame (55) through a bearing.

5. A subsea cable joint sealing arrangement according to claim 1, characterised in that: The inside of the bottom frame (1) is rotatably provided with a bidirectional screw rod (12) through a bearing, two moving plates (13) are threadedly sleeved on the surface of the bidirectional screw rod (12), the connecting plates (14) are slidably sleeved at the two ends of the bidirectional screw rod (12), two inserting rods (16) are slidably inserted into the inside of the moving plate (13), and the other end of the inserting rod (16) is fixedly connected with the connecting plate (14); the first spring (17) is fixed between the inserting rod (16) and the inside of the moving plate (13); and the outer end of the moving plate (13) corresponding to the outer end of the inserting rod (16) is fixedly provided with a sealing ring (18).

6. A subsea cable joint sealing arrangement according to claim 1, characterised in that: The sealing assembly (2) further comprises a side plate (26), the butt joint end of the connecting frame (21) is fixedly provided with the side plate (26) at the bottom of both sides, the top of the fixed cone (11) is fixedly provided with a clamping plate (19), the top of the clamping plate (19) is provided with a clamping groove (110) at both sides, the side plate (26) is fixedly provided with a clamping block (27) on the side facing the clamping groove (110), and the clamping block (27) is slidably inserted into the clamping groove (110).

7. A subsea cable joint sealing arrangement according to claim 6, characterised in that: The top of the middle plate (15) is rotatably provided with a rotating plate (111) through a rotating shaft, and the two ends of the rotating plate (111) are slidably inserted with an extending plate (112); the outer end of the extending plate (112) is provided with a limiting groove (113); the connecting frame (21) is rotatably provided with a vertical rod (28) at the bottom corresponding to the limiting groove (113) through a bearing, and the bottom of the vertical rod (28) is inserted into the limiting groove (113).

8. A subsea cable joint sealing arrangement according to claim 1, characterised in that: The inflating assembly (4) further comprises a piston rod (45), the two gas cavities of the vertical plate (24) are slidably inserted with the piston rod (45) on the outside, and the piston rod (45) faces the middle side; the other side of the two gas cavities of the vertical plate (24) is fixedly provided with a gas pipe (44), and the gas pipe (44) penetrates the first gas bag (41) and the second gas bag (43).

9. A subsea cable joint sealing arrangement according to claim 8, characterised in that: The outer end of the piston rod (45) is sleeved with a second spring (46), and the other end of the second spring (46) is fixedly connected with the vertical plate (24).

10. A subsea cable joint sealing arrangement according to claim 9, characterised in that: The middle plate (15) is fixedly provided with a pushing frame (114) at the position corresponding to the outer end of the piston rod (45) on both sides, and the pushing frame (114) is in extrusion contact with the piston rod (45).

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