CN114069489A - Submarine cable installs auxiliary assembly - Google Patents
Submarine cable installs auxiliary assembly Download PDFInfo
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- CN114069489A CN114069489A CN202111356350.8A CN202111356350A CN114069489A CN 114069489 A CN114069489 A CN 114069489A CN 202111356350 A CN202111356350 A CN 202111356350A CN 114069489 A CN114069489 A CN 114069489A
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- sliding
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- outer shell
- fixedly arranged
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
- H02G1/10—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle in or under water
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Abstract
The invention belongs to the field of submarine cable arrangement operation devices, and relates to submarine cable installation auxiliary equipment which comprises an outer shell, wherein the middle part of the inner circumference of the outer shell is connected with the outer circumference of a cable, elastic air bags are fixedly arranged on two sides of the outer circumference of the outer shell, one end of the outer shell is symmetrically provided with a plurality of first sliding shells along the center of the outer shell, a first sliding block is arranged in the first sliding shells in a sliding mode, the first sliding block is connected with the outer shell through a first spring, one side, facing the outer shell, of the first sliding block is fixedly provided with a striker, a chemical agent is fixedly arranged at the bottom in the first sliding shells, first grooves are fixedly arranged on two sides and the upper end of the outer shell, one side of the middle part in each first groove is provided with a first groove body, first one-way teeth are fixedly arranged in the first groove body, a rotating block is arranged in the first groove body in a sliding mode, one end of the rotating block is fixedly provided with second one-way teeth, and the second one-way teeth are meshed with the first one-way teeth. The auxiliary floating device can perform auxiliary floating in the submarine cable laying process and simultaneously prevent twisting in the cable sinking process and perform auxiliary fixing on the cable in the seabed.
Description
Technical Field
The invention belongs to the field of submarine cable arrangement operation devices, and particularly relates to submarine cable installation auxiliary equipment
Background
Submarine cables are cables wrapped with insulating materials and laid on the sea bottom for telecommunication transmission. Submarine cables are divided into submarine communication cables and submarine power cables. Modern submarine cables use optical fiber as the material to transmit telephone and internet signals.
Submarine cables are divided into submarine communication cables and submarine power cables. Submarine communication cables are mainly used for communication services, are expensive, and have high confidentiality. The submarine power cable is mainly used for transmitting high-power electric energy underwater, has the same effect as an underground power cable, and is different from the submarine power cable in application occasions and laying modes. As submarine cable engineering is recognized by countries around the world as a complex and difficult large-scale project, complex technologies are applied from environmental exploration, marine physics surveys, and cable design, manufacture, and installation.
The laying of submarine cables needs to drag the optical cables to a specified distance through a ship and then throw the optical cables into water, and each end of the submarine cables needs to be fixed with a buoy on the cable from constructors to enable blue wires thrown into the sea to float on the water surface and wait for a traction device to fix one end of the cable on the shore and then remove the buoy, so that the process is complicated, and improvement is needed.
The problem to be solved is as follows:
1. the cable can float on the water surface without manually fixing the buoy;
2. in the process that the cable is submerged into water, the seawater is stirred to enable the cable to rotate and twist;
disclosure of Invention
The invention aims to solve the problems in the prior art, and provides auxiliary equipment for installing a submarine cable, which can perform auxiliary floating in the submarine cable laying process and simultaneously prevent twisting in the cable sinking process and perform auxiliary fixing on the cable in the seabed.
In order to achieve the purpose, the invention adopts the following technical scheme: an auxiliary device for submarine cable installation comprises an outer shell, wherein the middle part of the inner circumference of the outer shell is connected with the outer circumference of a cable, elastic airbags are fixedly arranged on two sides of the outer circumference of the outer shell, one end of the outer shell is symmetrically provided with a plurality of first sliding shells along the center of the outer shell, first sliding blocks are arranged in the first sliding shells in a sliding manner and connected with the outer shell through first springs, a striker is fixedly arranged on one side, facing the outer shell, of the first sliding blocks, chemical agents are fixedly arranged at the bottom in the first sliding shells, first grooves are fixedly arranged on two sides and the upper end of the outer shell, a first groove body is arranged on one side of the middle part in each first groove, first one-way teeth are fixedly arranged in each first groove body, a rotating block is arranged in each first groove body in a sliding manner, one end of each rotating block is fixedly provided with second one-way teeth, and the second one-way teeth are meshed with the first one-way teeth, the middle part of one end of the rotating block is connected with a third rotating block in a sliding mode, the other end of the rotating block is fixedly provided with a support rod, and the support rod rotates in the first groove.
Preferably, one side of vaulting pole is equipped with the second and slides the casing, it is equipped with first slide bar to slide in the second slides the casing, the output of first slide bar has set firmly the installation piece, the installation piece passes through the second spring and links to each other with the vaulting pole, the one end of installation piece has set firmly the connecting rod, the one end of connecting rod has set firmly the bevel piece.
Preferably, a second cell body has set firmly in the lateral wall in the first recess, the axis of rotation has set firmly in the second cell body, sliding connection has the second turning block in the axis of rotation, the second screw thread has set firmly in the one side middle part through-hole of second cell body, it is equipped with sealed piece to slide in the second screw thread, the one end of second turning block links to each other with the vaulting pole, the second turning block has set firmly the removal track in being close to one side of second cell body, it is equipped with the installation slider to slide in the removal track, the middle part of installation slider has set firmly the thread piece, set firmly first screw thread on the side outer circumference of thread piece, the one end of thread piece has set firmly the rotation connecting axle, it passes vaulting pole and third turning block fixed connection to rotate the connecting axle.
Preferably, the below of sealed piece is equipped with the air channel in the middle part of shell body both sides, set firmly a plurality of flexible casings along sealed piece length direction in the below of shell body both sides middle part elasticity gasbag, it is equipped with the telescopic link to slide in the flexible casing, the output of telescopic link has set firmly the connecting block, the connecting block passes through the third spring and links to each other with flexible casing.
Preferably, a fourth sliding shell is fixedly arranged on one side of the rotating block in the first groove, a fifth sliding shell is arranged in the fourth sliding shell in a sliding mode, a sixth sliding shell is arranged in the fifth sliding shell in a sliding mode, and an electric telescopic block is arranged in the sixth sliding shell in a sliding mode.
Preferably, a second groove is formed in the lower end of the outer shell, a sliding plate is slidably arranged in the second groove, the sliding plate is connected with the bottom of the outer shell through a fourth spring, an elastic block is fixedly arranged at one end of the sliding plate, a second rotating shaft is slidably connected to two sides in the second groove, a gear is fixedly arranged outside the second rotating shaft, an arc-shaped toothed plate is slidably arranged on one side of the second rotating shaft, the gear is meshed with the arc-shaped toothed plate, a plurality of second sliding rods are abutted against the bottom of the outer shell, a second connecting block is fixedly arranged at one end of each second sliding rod, a plurality of third one-way teeth are fixedly arranged on the circumferential side surface of each second sliding rod along the height direction of the corresponding second sliding rod, the third one-way teeth are connected with one-way teeth in the middle of the sliding plate, a third groove is formed in the output end of each second sliding rod, and a third rotating shaft is fixedly arranged in the third groove, the third axis of rotation slides outward and is equipped with a plurality of second connecting rods, link to each other through the fifth spring between a plurality of second connecting rods, the output of second connecting rod sets firmly the resistance piece, the circumference side of third recess slides and is equipped with spacing slip casing.
Has the advantages that:
1. gas slowly reduces, and when the buoyancy of gasbag was less than gravity, the cable sinks gradually, and the in-process that sinks, the inside gas of gasbag has not leaked completely yet, and the gasbag can drive the cable and keep more stable direction, avoids the cable to be twisted round.
2. After the cable is completely immersed in water, the cable can be fixed on the seabed as much as possible through impact generated by falling to the seabed, and the cable is prevented from shaking everywhere.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a side view of the present invention.
Fig. 3 is a front view of the present invention.
Fig. 4 is a sectional view taken along a-a in fig. 3.
Fig. 5 is a sectional view taken along line B-B in fig. 4.
Fig. 6 is a sectional view taken along line C-C in fig. 4.
Fig. 7 is a sectional view taken along line D-D in fig. 3.
Fig. 8 is an enlarged view of the structure at E in fig. 5.
Fig. 9 is an enlarged view of the structure at F in fig. 7.
FIG. 10 is an enlarged view of the structure at G in FIG. 7
In the figure, an outer case 10, a cable 11, an elastic airbag 12, a first sliding case 13, a first slider 14, a first spring 15, a chemical agent 16, a striker 17, a first groove 18, a rotating block 19, a stay 20, a second sliding case 21, a first slide bar 22, a mounting block 23, a second spring 24, a connecting rod 25, a slope block 26, a second rotating block 27, a first groove 28, a first one-way tooth 29, a second one-way tooth 30, a third rotating block 31, a rotating connecting shaft 32, a second groove 33, a rotating shaft 34, a moving rail 35, a mounting slider 36, a screw block 37, a first screw 38, a second screw 39, a seal block 40, a vent groove 41, a telescopic case 42, a telescopic bar 43, a connecting block 44, a third spring 45, a fourth sliding case 46, a fifth sliding case 47, a sixth sliding case 48, an electric telescopic block 49, a second groove 50, a sliding plate 51, a fourth spring 52, a second spring 52, a third sliding block 31, a second sliding block 32, a second sliding block, a connecting block, The device comprises a second rotating shaft 53, a gear 54, an arc-shaped toothed plate 55, an elastic block 56, a second sliding rod 57, a second connecting block 58, a third one-way tooth 59, a third groove 60, a third rotating shaft 61, a second connecting rod 62, a fifth spring 63, a resistance block 64 and a limiting sliding shell 65.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
In the description of the present invention, it should be noted that the terms "inside", "below", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally place when used, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1-10, an auxiliary device for installing a submarine cable comprises an outer casing 10, wherein the middle portion of the inner circumference of the outer casing 10 is provided with a plurality of first sliding casings 13 connected to the outer circumference of a cable 11, two sides of the outer circumference of the outer casing 10 are fixedly provided with elastic airbags 12, one end of the outer casing 10 is symmetrically provided with a plurality of first sliding casings 13 along the center of the outer casing 10, the first sliding casings 13 are internally provided with first sliding blocks 14, the first sliding blocks 14 are connected to the outer casing 10 through first springs 15, one side of the first sliding blocks 14 facing the outer casing 10 is fixedly provided with a striking rod 17, the bottom of the first sliding casings 13 is fixedly provided with a chemical agent 16, two sides and the upper end of the outer casing 10 are fixedly provided with first grooves 18, one side of the middle portion of the first grooves 18 is provided with first grooves 28, the first grooves 28 are internally provided with first unidirectional teeth 29, the first grooves 28 are internally provided with rotating blocks 19 in a sliding manner, one end of the rotating blocks 19 is fixedly provided with second unidirectional teeth 30, the second one-way tooth 30 is meshed with the first one-way tooth 29, the middle part of one end of the rotating block 19 is connected with a third rotating block 31 in a sliding mode, the other end of the rotating block 19 is fixedly provided with a support rod 20, and the support rod 20 rotates in the first groove 18.
Furthermore, a second sliding shell 21 is arranged on one side of the supporting rod 20, a first sliding rod 22 is arranged in the second sliding shell 21 in a sliding mode, an output end of the first sliding rod 22 is fixedly provided with a mounting block 23, the mounting block 23 is connected with the supporting rod 20 through a second spring 24, one end of the mounting block 23 is fixedly provided with a connecting rod 25, and one end of the connecting rod 25 is fixedly provided with a slope block 26.
Further, a second groove body 33 is fixedly arranged in one side wall of the first groove 18, a rotating shaft 34 is fixedly arranged in the second groove body 33, a second rotating block 27 is connected in the rotating shaft 34 in a sliding mode, a second thread 39 is fixedly arranged in a through hole in the middle of one side of the second groove body 33, a sealing block 40 is slidably arranged in the second thread 39, one end of the second rotating block 27 is connected with the support rod 20, a moving track 35 is fixedly arranged in one side, close to the second groove body 33, of the second rotating block 27, an installation sliding block 36 is slidably arranged in the moving track 35, a thread block 37 is fixedly arranged in the middle of the installation sliding block 36, a first thread 38 is fixedly arranged on the outer circumference of the side face of the thread block 37, a rotating connecting shaft 32 is fixedly arranged at one end of the thread block 37, and the rotating connecting shaft 32 penetrates through the support rod 20 and is fixedly connected with the third rotating block 31.
Further, the lower side of the middle inner sealing blocks 40 on the two sides of the outer shell 10 is provided with a vent groove 41, a plurality of telescopic shells 42 are fixedly arranged in the lower side of the middle elastic air bags 12 on the two sides of the outer shell 10 along the length direction of the sealing blocks 40, telescopic rods 43 are slidably arranged in the telescopic shells 42, the output ends of the telescopic rods 43 are fixedly provided with connecting blocks 44, and the connecting blocks 44 are connected with the telescopic shells 42 through third springs 45.
Further, a fourth sliding shell 46 is fixedly arranged on one side of the rotating block 19 in the first groove 18, a fifth sliding shell 47 is arranged in the fourth sliding shell 46 in a sliding manner, a sixth sliding shell 48 is arranged in the fifth sliding shell 47 in a sliding manner, and an electric telescopic block 49 is arranged in the sixth sliding shell 48 in a sliding manner.
Further, a second groove 50 is formed at the lower end of the outer shell 10, a sliding plate 51 is slidably disposed in the second groove 50, the sliding plate 51 is connected to the bottom of the outer shell 10 through a fourth spring 52, an elastic block 56 is fixedly disposed at one end of the sliding plate 51, a second rotating shaft 53 is slidably connected to two sides in the second groove 50, a gear 54 is fixedly disposed outside the second rotating shaft 53, an arc-shaped toothed plate 55 is slidably disposed at one side of the second rotating shaft 53, the gear 54 is engaged with the arc-shaped toothed plate 55, a plurality of second sliding rods 57 are abutted to the bottom of the outer shell 10, a second connecting block 58 is fixedly disposed at one end of each second sliding rod 57, a plurality of third one-way teeth 59 are fixedly disposed on the circumferential side surface of each second sliding rod 57 along the height direction of the second sliding rod 57, the third one-way teeth 59 are connected to one-way teeth in the middle of the sliding plate 51, a third groove 60 is disposed at the output end of each second sliding rod 57 passing through the sliding plate 51, a third rotating shaft 61 is fixedly disposed in the third groove 60, a plurality of second connecting rods 62 are arranged outside the third rotating shaft 61 in a sliding mode, the second connecting rods 62 are connected through fifth springs 63, resistance blocks 64 are fixedly arranged at the output ends of the second connecting rods 62, and a limiting sliding shell 65 is arranged on the circumferential side face of the third groove 60 in a sliding mode.
Principle of operation
When the middle part of the outer shell 10 is connected with the cable, when the cable is pulled to shore through a ship and connected with shore, the first slide block 14 at one end of the outer shell 10 is extruded by the impact force of seawater, so that the first slide block 14 slides towards the first slide shell 13, the impact rod 17 impacts the chemical agent 16 to generate a large amount of gas through reaction, since the elastic bag 12 is wrapped and sealed around the upper half of the outer case 10, the elastic bag 12 is inflated, meanwhile, seawater enables the support rod 20 to rotate along the rotating block 19 and the second rotating block 27 through an oblique force generated by the impact slope block 26, the support rod 20 is distributed at two sides and the upper end of the outer shell 10, the support rod 20 rotates to abut against one side of the electric telescopic block 49, the support rod 20 cannot rotate continuously to support the elastic airbag 12, and when the support rod 20 supports the elastic airbag 12, the elastic airbag 12 can be fixed outwards through the matching of the first slide rod 22 and the second spring 24, so that the outer shell 10 drives the cable to float on the sea surface.
When the stay bar 20 rotates, the second rotating block 27 is driven to rotate, the second rotating block 27 rotates to enable the thread block 37 to rotate and slide downwards in the second thread 39, the thread block 37 slides downwards to drive the rotating connecting shaft 32 to pull the rotating block 19 downwards to enable the second one-way teeth 30 to be meshed with the first one-way teeth 29, the stay bar 20 can only rotate in one direction after the second one-way teeth 30 are meshed with the first one-way teeth 29, and when the elastic airbag 12 is completely unfolded by the stay bar 20, one end of the thread block 37 is abutted to the sealing block 40, and then the stay bar 20 is limited by the electric expansion block 49 to not rotate any more.
After the fixed connection of the cable on the shore is finished, the electric telescopic block 49 is driven to slide downwards, the limitation of the stay bar 20 is removed, the stay bar 20 continues to rotate, the sealing block 40 is extruded by the thread block 37, the sealing block 40 slides downwards, after a certain distance, the exhaust port on one side of the elastic air bag 12 is opened by the sealing block 40, the interior of the elastic air bag 12 is slowly exhausted, and when the buoyancy is smaller than the gravity in the exhaust process, the outer shell 10 starts to drive the cable to sink.
The connecting block 44 can clamp the elastic airbag 12 and press and seal the sealing block 40 at the exhaust port of the elastic airbag 12 through the cooperation of the telescopic rod 43 and the third spring 45.
When the outer shell 10 sinks, the gas in the elastic air bag 12 is not completely discharged, the overall direction of the cable is uniformly upward due to the action of buoyancy, and when the sea wave impacts, the cable cannot be completely twisted along with the impact of the sea wave.
When the outer casing 10 is completely contacted with the seabed, the elastic block 56 can buffer the impact generated by sinking, the sliding plate 51 is pressed to slide upwards to extrude the second sliding rod 57, the second sliding rod 57 slides to contact the resistance block 64 with the seabed, the fifth spring 63 is pressed to pull the two second connecting rods 62 outwards due to the impact generated by sinking, and when the impact force disappears, the two second connecting rods 62 begin to retract to clamp the seabed, so that the outer casing 10 is fixed.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The submarine cable installation auxiliary equipment comprises an outer shell (10) and is characterized in that the middle of the inner circumference of the outer shell (10) is connected with the outer circumference of a cable (11), elastic air bags (12) are fixedly arranged on the two sides of the outer circumference of the outer shell (10), one end of the outer shell (10) is symmetrically provided with a plurality of first sliding shells (13) along the center of the outer shell (10), a first sliding block (14) is arranged in each first sliding shell (13) in a sliding manner, each first sliding block (14) is connected with the outer shell (10) through a first spring (15), a striker (17) is fixedly arranged on one side, facing the outer shell (10), of each first sliding block (14), a chemical agent (16) is fixedly arranged at the inner bottom of each first sliding shell (13), first grooves (18) are fixedly arranged on the two sides and the upper end of the outer shell (10), a first groove body (28) is arranged on one side of the inner middle of each first groove (18), first cell body (28) internal fixation has first one-way tooth (29), it is equipped with turning block (19) to slide in first cell body (28), the one end of turning block (19) has set firmly one-way tooth (30) of second, one-way tooth (30) of second mesh with first one-way tooth (29) mutually, sliding connection has third turning block (31) in the middle part of the one end of turning block (19), the other end of turning block (19) has set firmly vaulting pole (20), vaulting pole (20) internal rotation in first recess (18).
2. A submarine cable installation aid according to claim 1, wherein: one side of vaulting pole (20) is equipped with second slip casing (21), it is equipped with first slide bar (22) to slide in second slip casing (21), the output of first slide bar (22) has set firmly installation piece (23), installation piece (23) link to each other with vaulting pole (20) through second spring (24), the one end of installation piece (23) has set firmly connecting rod (25), the one end of connecting rod (25) has set firmly bevel piece (26).
3. A submarine cable installation aid according to claim 1, wherein: a second groove body (33) is fixedly arranged in one side wall of the first groove (18), a rotating shaft (34) is fixedly arranged in the second groove body (33), a second rotating block (27) is connected in the rotating shaft (34) in a sliding manner, a second thread (39) is fixedly arranged in a through hole in the middle of one side of the second groove body (33), a sealing block (40) is arranged in the second thread (39) in a sliding manner, one end of the second rotating block (27) is connected with the supporting rod (20), a moving track (35) is fixedly arranged in one side, close to the second groove body (33), of the second rotating block (27), an installation sliding block (36) is arranged in the moving track (35) in a sliding manner, a thread block (37) is fixedly arranged in the middle of the installation sliding block (36), a first thread (38) is fixedly arranged on the outer circumference of the side face of the thread block (37), a rotating connecting shaft (32) is fixedly arranged at one end of the thread block (37), the rotating connecting shaft (32) penetrates through the support rod (20) and is fixedly connected with the third rotating block (31).
4. A submarine cable installation aid according to claim 1, wherein: the utility model discloses a flexible air bag, including shell body (10), shell body (10) both sides middle part internal seal piece (40), the below of shell body (10) both sides middle part internal seal piece (40) is equipped with air channel (41), set firmly a plurality of flexible casings (42) along sealed piece (40) length direction in the below of shell body (10) both sides middle part elastic airbag (12), it is equipped with telescopic link (43) to slide in flexible casing (42), the output of telescopic link (43) has set firmly connecting block (44), connecting block (44) link to each other with flexible casing (42) through third spring (45).
5. A submarine cable installation aid according to claim 1, wherein: one side of turning block (19) in first recess (18) has set firmly fourth slip casing (46), it is equipped with fifth slip casing (47) to slide in fourth slip casing (46), it is equipped with sixth slip casing (48) to slide in fifth slip casing (47), it is equipped with electronic flexible piece (49) to slide in sixth slip casing (48).
6. A submarine cable installation aid according to claim 1, wherein: the lower end of the outer shell (10) is provided with a second groove (50), a sliding plate (51) is arranged in the second groove (50) in a sliding mode, the sliding plate (51) is connected with the bottom of the outer shell (10) through a fourth spring (52), one end of the sliding plate (51) is fixedly provided with an elastic block (56), two sides in the second groove (50) are connected with a second rotating shaft (53) in a sliding mode, a gear (54) is fixedly arranged outside the second rotating shaft (53), one side of the second rotating shaft (53) is provided with an arc-shaped toothed plate (55) in a sliding mode, the gear (54) is connected with the arc-shaped toothed plate (55) in a meshing mode, the bottom of the outer shell (10) is abutted to a plurality of second sliding rods (57), one end of each second sliding rod (57) is fixedly provided with a second connecting block (58), and a plurality of third one-way teeth (59) are fixedly arranged on the circumferential side face of each second sliding rod (57) along the height direction of each second sliding rod (57), the third one-way gear (59) is connected with the one-way gear in the middle of the sliding plate (51), the output end of the second sliding rod (57) penetrates through the sliding plate (51) to be provided with a third groove (60), a third rotating shaft (61) is fixedly arranged in the third groove (60), a plurality of second connecting rods (62) are arranged outside the third rotating shaft (61) in a sliding mode, the second connecting rods (62) are connected through fifth springs (63), the output end of each second connecting rod (62) is fixedly provided with a resistance block (64), and the circumferential side face of the third groove (60) is provided with a limiting sliding shell (65) in a sliding mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111356350.8A CN114069489B (en) | 2021-11-16 | 2021-11-16 | Submarine cable installation auxiliary equipment |
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|---|---|---|---|
| CN202111356350.8A CN114069489B (en) | 2021-11-16 | 2021-11-16 | Submarine cable installation auxiliary equipment |
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| CN114069489A true CN114069489A (en) | 2022-02-18 |
| CN114069489B CN114069489B (en) | 2023-08-22 |
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