Optical cable laying and recycling device for cable laying ship and using method of optical cable laying and recycling device

Abstract

The invention relates to the technical field of submarine optical cable laying ship related equipment, and discloses a cable laying ship optical cable laying and recycling device and a using method thereof.The cable laying ship optical cable laying and recycling device comprises a laying and recycling device body located at the stern of a cable laying ship, and the laying and recycling device body comprises a stern pulley, a hinge type protection rod and a shaft supporting seat; the stern pulley comprises a left roller body and a right roller body which do not interfere with each other, the center of the stern pulley is connected with a center shaft through a supporting ring, the two ends of the center shaft are connected with a stern through shaft supporting bases, an oil supply channel is formed in the center shaft, and hinge type protection rods are arranged above the roller bodies. The method comprises: laying sea optical cables; burying the optical cable; and recovering the submarine cable. The cable laying device is composed of the two roller single bodies, the two roller single bodies do not interfere with each other and can freely rotate around the center shaft, and therefore the laying and recycling process of optical cables or other cable laying accessories is very smooth, and the situation that work is affected due to blocking of the single roller is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment related to a submarine optical cable laying vessel, and in particular to an optical cable laying and recovery device for a submarine optical cable laying vessel and a method for using the same. Background Art

[0002] With the rapid development of communication technology and people's increasing requirements for communication bandwidth and quality, it is very difficult to achieve communication between countries or regions by laying optical cables on land due to the large proportion of the world's ocean area and its wide distribution. It is also difficult to build optical cable transfer stations on the sea level. Therefore, in order to effectively achieve long-distance communication, it is particularly important to vigorously lay communication optical cables on the seabed. Cable-laying vessels are special ships for laying submarine optical cables. They rely on specific ship-borne stern pulleys to achieve the functions of laying and recovering optical cables. At present, the main body of the stern pulley for laying and recovering optical cables on general cable-laying vessels is often a single pulley structure. When recovering and laying optical cables, if a single pulley occurs, the friction changes from rolling friction to sliding friction, and the optical cable is blocked during entry and exit, and the resistance increases, affecting the work.

[0003] In the document CN201410469841, a pulley device and a construction method for laying optical cables are disclosed, the device includes a base 1, a U-shaped block 2, a columnar connecting block 3, a pulley 4, a bearing screw 5, a clamping plate 6, and a rotor 7. The base 1 and the U-shaped iron plate 2 are connected by a columnar connecting block 3, and the columnar connecting block 3 is divided into two parts, the upper part is clamped on the U-shaped block 2, and the lower part is welded and fixed on the base 1. The U-shaped block 2, the pulley 4, and the clamping plate 6 are fixedly connected to the bearing screw 5 by nuts. The pulley 4 is connected in series with the bearing screw 5 in the middle of the U-shaped block 2. The bearing screw 5 penetrates the U-shaped block 2, the pulley 4, and the clamping plate 6, and is tightened by rotating the nuts on both sides of the bearing screw 5. The two ends of the rotor 7 are fixed to the clamping plate 6 by screws and nuts. The pulley of this structure can only lay out and reel in the optical cable, has a single function, cannot lay out and reel in the optical cable at the same time, and has low working efficiency.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0005] In order to solve the above problems, the present invention discloses an optical cable laying and recovery device for a cable-laying ship and a method of using the same. The device is composed of two drum units, which do not interfere with each other and can rotate freely around the central axis. Therefore, the laying and recovery process of the optical cable or other cable-laying accessories is very smooth, and the work will not be affected by the blockage of a single drum.

[0006] The technical solution of the present invention is: a cable laying and recovery device for a cable-laying ship, including a laying and recovery device located at the stern of the cable-laying ship, the laying and recovery device including a stern pulley, a hinged protection rod and an axis support seat, the stern pulley includes two non-interfering roller monomers, namely a left pulley and a right pulley, the center of the stern pulley is connected to the central shaft through a support ring, the two ends of the central shaft are connected to the stern through the axis support seat, an oil supply channel is opened on the central shaft, and a hinged protection rod is provided above the roller monomer.

[0007] By adopting the above technical solution, the stern pulley body is composed of two drum units, which do not interfere with each other and can rotate freely around the central axis. Therefore, the laying and recovery process of optical cables or other cable laying accessories is very smooth, and the work will not be affected by the blockage of a single drum.

[0008] Preferably, bearings are provided at both ends of the support ring in the drum unit, the diameter of the central axis part between the drum units is larger than the two ends, and an outward step is provided, the bearing on the inner side of the drum unit just abuts against the step, and the outer bearing is limited by the shaft ring on the central axis.

[0009] By adopting the above technical solution, the protruding position of the central axis is used to abut the bearing, and the shaft ring abuts the bearing on the outside, thus preventing the roller unit from axially moving on the central axis. Under the abutment of the step and the shaft ring, the roller unit always rotates around the central axis.

[0010] Preferably, the parts where the bearings on both sides of the drum unit contact the central axis are respectively provided with inner end covers and outer end covers, the central axis passes through the center of the stern pulley, the bearings bear the force between the two, the support ring is sleeved on the central axis, and is located between the two bearings, the outer end covers and the inner end covers both abut against the bearings, the inner end cover is just located in the bearing groove of the drum unit, the inner end cover does not protrude from the outer surface of the drum unit, the shaft ring is located on the inner side of the outer end cover, and the inner end cover and the outer end cover are both connected to the drum unit by screws.

[0011] By adopting the above technical solution, the outer end cover and the inner end cover just play a role of abutting against the bearing of the drum unit, and can prevent the bearing from falling off and causing oil leakage.

[0012] Preferably, the support ring includes an inner ring support ring and an outer ring support ring. The inner ring support ring is close to the surface of the central axis, the outer ring support ring is located outside the inner ring support ring and is concentric with the inner ring support ring. Both ends of the inner ring support ring and the outer ring support ring abut against the bearing, and an oil chamber is formed between the inner ring support ring, the outer ring support ring and the bearing.

[0013] By adopting the above technical solution, the lubricating oil enters from the oil supply channel and flows into the oil cavity formed between the inner ring support ring and the outer ring support ring, and then flows to the bearing, lubricating the bearing and reducing the friction between the roller unit and the bearing.

[0014] Preferably, the oil supply channel is in an inverted L shape, one end of the oil supply channel is connected to the center of the end of the central shaft, and the other end is connected to the oil chamber. A pipe joint is also provided on the oil supply channel outside the central shaft.

[0015] By adopting the above technical solution, when oil needs to be injected, the pipe joint is opened and the oil is then passed into the oil supply channel. When oil injection is not required, the pipe joint is screwed into the end of the oil supply channel to prevent oil leakage.

[0016] Preferably, the roller monomers are symmetrical to each other and do not contact each other. The roller monomers are all provided with radial pulley spokes. The roller monomer is a boundless pulley. A lifting ring is provided on the shaft support seat. The shaft support seat is connected to the stern deck through a bolt group. The roller monomer is located in a groove formed by the hull structure on both sides of the stern circular groove.

[0017] By adopting the above technical solution, when the drum unit needs to be installed, it can be easily lifted through the lifting ring on the lifting shaft support seat to the stern groove. The functions of two adjacent drum units are the same. When one of them is stuck, the other can continue to undertake the work of deployment or recovery.

[0018] Preferably, the hinged protection bar is located above the stern circular groove, and a hinged protection bar stopper is respectively provided at the working position and the standby position of the hinged protection bar, and the hinged protection bar stopper plays a role of limiting and stopping the hinged protection bar.

[0019] By adopting the above technical solution, the hinged protection rod can reach its standby position by rotating 90 degrees clockwise from its working position. A hinged protection rod stopper is provided at the corresponding position of the rod tip in its working position and the standby position to lock and fix the hinged protection rod after it reaches the specified position. When in the working position, it can prevent the optical cable from jumping.

[0020] Preferably, the standby position is a hinged protection bar located on one side of the drum unit and parallel to the roller unit, and the working position is a hinged protection bar spanning the drum unit and perpendicular to it in space.

[0021] A working method of an optical cable laying and recovery device of a cable-laying vessel, comprising the following steps: A. The method of laying submarine optical cables includes the following steps: Step 1: Bury the plow shift There is no need to use an embedded plow in this working condition, so it is hoisted to the standby position; Step 2: Put the protective rod in place Turn the hinged protection bar 90° counterclockwise from the standby position to the working position; Step 3: Submarine cable in place The submarine optical cable is transported from the cable trough to the location of the optical cable laying and recovery device; Step 4: Submarine cable laying The submarine cable runs along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located, and naturally falls from the stern to the seabed. The cable-laying ship uses the laying and recovery device to transport the optical cable while moving, and continuously carries out the surface laying of the submarine cable; Step 5: Submarine cable laying completed When the optical cable laying task of the preset laying route is completed, the submarine optical cable laying work is ended, and the hinged protection rod is rotated 90° clockwise to the standby position of the hinged protection rod stopper; B. The optical cable burial method includes the following steps Step 1: Lay the umbilical cable and lay it out Before starting the work, it is necessary to use the burying plow umbilical cable winch to release the cable and connect the burying plow umbilical cable to the burying plow 300; Step 2: Put the protective rod in place Turn the hinged protection bar 90° counterclockwise from the hinged protection bar stopper in the standby position to the working position; Step 3: Submarine cable in place The submarine cable is transported from the cable trough to the location of the cable laying and recovery device. The submarine cable travels along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located; Step 4: Set the plow in place S1: Lead the submarine optical cable that slides out from the stern pulley to the designated working position on the burying plow; S2: Use the A-frame of the burying plow to hoist the burying plow from the standby position to the sea surface at the stern of the ship, and prepare to put the burying plow into the water; S3: The burying plow carries the burying plow umbilical cable and the submarine optical cable into the water and reaches the seabed working position; Step 5: Submarine cable laying The cable-laying ship moves forward, driving the burying plow to dig trenches and start burying work. The cable-laying ship uses the laying and recovery device to transport the optical cable to the burying plow while moving forward, so that the submarine burying work of the submarine optical cable can be carried out continuously; Step 6: Submarine cable laying completed When the optical cable burial task of the preset burial route is completed, the submarine optical cable burial work is ended, and the hinged protection rod is rotated 90° clockwise to the standby position; C. The method for recovering submarine optical cables comprises the following steps: Step 1: Bury the plow shift There is no need to use an embedded plow in this working condition, so it is hoisted to the standby position; Step 2: Put the protective rod in place Turn the hinged protection bar 90° counterclockwise from the standby position to the working position; Step 3: Recycling Preparation The cable head of the submarine cable to be recovered is pulled to the stern laying and recovery device. The submarine cable moves along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located, and the cable head is pulled to the ship-borne cable recovery power equipment; Step 4: Recycling submarine cables The optical cable recovery power equipment provides traction to continuously recover the optical cables to be recovered; Step 5: Submarine cable recycling ends When all the optical cables to be recovered are recovered on board, the submarine optical cable recovery work is completed, and the hinged protection rod is rotated 90° clockwise to the standby position.

[0022] Preferably, the outdoor cable trough is located on the hull structure, the laying and recovery device is located on one side of the outdoor cable trough, and the other side of the outdoor cable trough is a burying plow towing winch. A burying plow umbilical cable winch is provided above the laying and recovery device, and the burying plow umbilical cable winch is provided with a burying plow and a burying plow A-frame.

[0023] Advantages of the present invention: 1. The present invention is composed of two roller monomers, which do not interfere with each other and can rotate freely around the central axis. Therefore, the laying and recovery process of optical cables or other cable laying accessories is very smooth, and the work will not be affected by the blockage of a single roller.

[0024] 2. The present invention lubricates the bearings and the like through the lubrication channel, effectively reducing the friction between the shaft and the bearings and extending the service life of the entire device.

[0025] 3. The pulley block of the present invention adopts a groove-free pulley structure to reduce the resistance between the optical cable and the pulley. It is installed between the groove structures at the stern of the hull and is located exactly in the groove at the stern. When the optical cable moves, the optical cable is always located in the groove, which limits the laying and recovery path of the optical cable and prevents it from moving left and right.

[0026] 4. A hinged protection rod is provided above the installation position of the stern pulley of the present invention. When the optical cable is being transported, laid or recovered, it may experience a large jump due to excessive speed. When the hinged protection rod is in the working position, it can play a role of limiting protection, thereby preventing the optical cable from deviating from the working path due to large jumps and thus damaging the optical cable itself.

[0027] 5. The overall structure of the invented device is compact. It is installed at the stern of the ship, takes up almost no deck space, and is not easy to interfere with other devices on the ship. It can be used in working scenarios such as surface laying and seabed burial of submarine optical cables. It can realize the deployment and recovery of submarine optical cables and underwater devices such as repeaters and splitters, as well as cable laying accessories such as chains and ropes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of the invention; Figure 2 It is a schematic structural diagram of a side view of the invention; Figure 3 It is a schematic diagram of the structure of the top view of the invention; Figure 4 It is a structural schematic diagram of the invented drum unit; Figure 5 It is a schematic diagram of the structure of the axial cross-sectional view of the pulley of the invention; Figure 6 The figure is a schematic diagram of the lubrication mechanism structure of the invented pulley shaft; Figure 7 It is a structural schematic diagram of the fixing method of the invention; Figure 8 To invent a schematic diagram of the surface laying working conditions of a submarine optical cable; Fig. 9 To invent a schematic diagram of the submarine cable laying conditions; Fig.10 The present invention is a schematic diagram of the recovery working condition of submarine optical cables.

[0029] Wherein: 10, central axis, 20, left pulley, 30, right pulley, 40, shaft support seat, 50, pulley spokes, 60, optical cable, 70, inner end cover, 80, outer end cover, 90, drum unit; 11. bearing, 12. shaft collar, 13. inner ring support ring, 14. screw, 15. oil supply channel, 41. outer ring support ring, 42. lifting ring, 43. pipe joint, 44. bolt group, 45. hinged protection rod, 46. hinged protection rod stopper; 100-burying plow towing winch, 200-burying plow A-frame, 300-burying plow, 400-outdoor cable trough, 500-laying and recovery device, 600-burying plow umbilical cable winch. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] like Figure 1-7As shown, the optical cable laying and recovery device of the cable-laying ship includes a laying and recovery device 500 located at the stern of the cable-laying ship, the laying and recovery device 500 includes a stern pulley, a hinged protection rod 45 and an axle support seat 40, the stern pulley includes two roller monomers 90 that do not interfere with each other, namely a left pulley 20 and a right pulley 30, the center of the stern pulley is connected to the central axis 10 through a support ring, the two ends of the central axis 10 are connected to the stern through the axle support seat 40, an oil supply channel 15 is opened on the central axis 10, a hinged protection rod 45 is arranged above the roller monomer, the stern pulley body is composed of two roller monomers 90, the two roller monomers 90 do not interfere with each other, and can rotate freely around the central axis 10, so the laying and recovery process of the optical cable or other cable-laying accessories is very smooth, and the work will not be affected by the blockage of a single roller.

[0032] Bearings 11 are provided at both ends of the support ring inside the roller monomer 90. The diameter of the central axis 10 portion between the roller monomers 90 is larger than the two ends, and an outward step is provided. The bearing 11 on the inner side of the roller monomer 90 just abuts against the step, and the outer bearing 11 is limited by the shaft ring 12 on the central axis 10. The protruding position of the central axis 10 is just used to abut the bearing 11, and the shaft ring 12 abuts against the bearing 11 on the outside, thereby preventing the roller monomer 90 from axially moving on the central axis 10. Under the abutment of the step and the shaft ring 12, the roller monomer 90 always rotates around the central axis 10.

[0033] The contact parts of the bearings 11 and the central shaft 10 on both sides of the drum unit 90 are respectively provided with inner end covers 70 and outer end covers 80. The central shaft 10 passes through the center of the stern pulley, and the bearing 11 bears the force between the two. The support ring is sleeved on the central shaft 10 and is located between the two bearings 11. The outer end cover 80 and the inner end cover 70 both abut against the bearing 11. The inner end cover 80 is just located in the bearing groove of the drum unit 90. The inner end cover 70 does not protrude from the outer surface of the drum unit 90. The shaft ring 12 is located on the inner side of the outer end cover 80. The inner end cover 70 and the outer end cover 80 are both connected to the drum unit 90 by screws 14. The outer end cover 80 and the inner end cover 70 just abut against the bearing 11 of the drum unit 90 and can prevent the bearing 11 from falling off and causing oil leakage.

[0034] The support ring includes an inner ring support ring 13 and an outer ring support ring 41. The inner ring support ring 13 is in close contact with the surface of the central shaft 10. The outer ring support ring 41 is located outside the inner ring support ring 13 and is concentric with the inner ring support ring 13. Both ends of the inner ring support ring 13 and the outer ring support ring 41 abut against the bearing 11. An oil cavity is formed between the inner ring support ring 13, the outer ring support ring 41 and the bearing 11. The lubricating oil enters from the oil supply channel 15 and flows into the oil cavity formed between the inner ring support ring 13 and the outer ring support ring 41, and then flows to the bearing 11, thereby lubricating the bearing 11 and reducing the friction between the roller unit 90 and the bearing 11.

[0035] The oil supply channel 15 is in an inverted L-shape, with one end of the oil supply channel 15 being connected to the center of the end of the central shaft 10, and the other end being connected to the oil chamber. A pipe joint 43 is also provided on the oil supply channel 15 outside the central shaft 10. When oil needs to be injected, the pipe joint 43 is opened, and then the oil is passed into the oil supply channel 15. When oil injection is not required, the pipe joint 43 is screwed into the end of the oil supply channel 15 to prevent oil leakage.

[0036] The drum monomers 90 are symmetrical to each other and do not contact each other. The drum monomers 90 are all provided with radial pulley spokes 50. The drum monomers 90 are endless pulleys. The shaft support seat 40 is provided with a lifting ring 42. The shaft support seat 40 is connected to the stern deck through a bolt group 44. The stern pulley is located in a groove formed by the hull structure on both sides of the stern circular groove. When the stern pulley needs to be installed, the lifting ring 42 on the shaft support seat 40 can be lifted to the stern groove for easy lifting. The functions of two adjacent drum monomers 90 are the same. When one of them is stuck, the other can continue to undertake the work of deployment or recovery.

[0037] The hinged protection rod 45 is located above the stern circular groove. The working position and the standby position of the hinged protection rod 45 are each provided with a hinged protection rod stopper 46. The hinged protection rod stopper 46 serves as a limit stop for the hinged protection rod 45. The hinged protection rod 45 can reach its standby position by rotating 90 degrees clockwise from its working position. A hinged protection rod stopper 46 is respectively provided at the corresponding position of the rod tip of its working position and the standby position to lock and fix the hinged protection rod 45 after it reaches the specified position. When in the working position, it can prevent the optical cable from jumping.

[0038] The standby position is that the hinged protection rod 45 is located on one side of the stern pulley and is parallel to the stern pulley, and the working position is that the hinged protection rod 45 spans the stern pulley and is perpendicular to it in space.

[0039] like Figure 8-10 As shown, the working method of the optical cable laying and recovery device of the cable-laying vessel comprises the following steps: A. The method of laying submarine optical cables includes the following steps: Step 1: Bury the plow shift In this working condition, there is no need to use the buried plow 200, so it is hoisted to the standby position; Step 2: Put the protective rod in place Rotate the hinged guard 45 counterclockwise 90° from the standby position to the working position; Step 3: Submarine cable in place The submarine optical cable is transported from the cable trough 400 to the location of the optical cable laying and recovery device 500; Step 4: Submarine cable laying The submarine optical cable moves along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located, and naturally falls from the stern to the seabed. The cable-laying ship uses the laying and recovery device 500 to transport the optical cable while moving, and continuously performs the surface laying work of the submarine optical cable; Step 5: Submarine cable laying completed When the optical cable laying task of the preset laying route is completed, the submarine optical cable laying work is ended, and the hinged protection rod 45 is rotated 90° clockwise to the standby position of the hinged protection rod stopper 46; B. The optical cable burial method includes the following steps Step 1: Lay the umbilical cable and lay it out Before starting the work, it is necessary to use the burying plow umbilical cable winch 600 to release the cable and connect the burying plow umbilical cable to the burying plow 300; Step 2: Put the protective rod in place The hinged protection bar 45 is rotated 90° counterclockwise from the hinged protection bar stopper 46 in the standby position to the working position; Step 3: Submarine cable in place The submarine cable is transported from the cable trough 400 to the location of the cable laying and recovery device 500. The submarine cable travels along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where the submarine cable is located. Step 4: Set the plow in place S1: Lead the submarine optical cable that slides out from the stern pulley to the designated working position on the burying plow 300; S2: Using the burying plow A-frame 200, the burying plow 300 is hoisted from the standby position to the sea surface at the stern of the ship, and the burying plow is ready to enter the water; S3: The burying plow 300 carries the burying plow umbilical cable and the submarine optical cable into the water to reach the seabed working position; Step 5: Submarine cable laying The cable-laying ship moves forward, driving the burying plow 300 to move forward to dig trenches and start burying work. The cable-laying ship uses the laying and recovery device to transport the optical cable to the burying plow 300 while moving forward, so that the submarine burying work of the submarine optical cable can be continuously carried out; Step 6: Submarine cable laying completed When the optical cable burying task of the preset burying route is completed, the submarine optical cable burying work is ended, and the hinged protection rod 45 is rotated 90° clockwise to the standby position; C. The method for recovering submarine optical cables comprises the following steps: Step 1: Bury the plow shift In this working condition, there is no need to use the buried plow 200, so it is hoisted to the standby position; Step 2: Put the protective rod in place Rotate the hinged protection bar 45 counterclockwise 90° from the standby position to the working position; Step 3: Recycling Preparation The cable head of the submarine cable to be recovered is towed to the stern laying and recovery device 500, and the submarine cable moves along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located, and the cable head is towed to the ship-borne cable recovery power equipment; Step 4: Recycling submarine cables The optical cable recovery power equipment provides traction to continuously recover the optical cables to be recovered; Step 5: Submarine cable recycling ends When all the optical cables to be recovered are recovered on board, the recovery of the submarine optical cables is completed, and the hinged protection rod 45 is rotated 90° clockwise to the standby position.

[0040] The outdoor cable trough 400 is located on the hull structure, the deploying and recovery device 500 is located on one side of the outdoor cable trough 400, and the other side of the outdoor cable trough 400 is a burying plow towing winch 600. A burying plow umbilical cable winch 600 is arranged above the deploying and recovery device 500, and the burying plow umbilical cable winch 600 is provided with a burying plow 300 and a burying plow A-frame 200.

[0041] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A cable laying vessel optical cable laying and recovery device, comprising a laying and recovery device located at the stern of the cable laying vessel, the laying and recovery device comprising a stern pulley, a hinged protection rod and an axle support seat, characterized in that: The stern pulley includes two non-interfering roller units, namely a left pulley and a right pulley. The center of the stern pulley is connected to the central shaft through a support ring. Both ends of the central shaft are connected to the stern of the ship through a shaft support seat. An oil supply channel is opened on the central shaft, and a hinged protection rod is provided above the roller unit.

2. The optical cable laying and recovery device for a cable-laying vessel according to claim 1, characterized in that: Bearings are provided at both ends of the support ring in the roller unit. The diameter of the central axis between the roller units is larger than the two ends and is provided with outward steps. The bearings on the inner side of the roller unit just abut against the steps, and the bearings on the outer side are limited by the shaft ring on the central axis.

3. The optical cable laying and recovery device for a cable-laying vessel according to claim 2, characterized in that: The parts where the bearings on both sides of the drum unit contact the central axis are respectively provided with inner end covers and outer end covers. The central axis passes through the center of the stern pulley, and the bearing bears the force between the two. The support ring is sleeved on the central axis and is located between the two bearings. The outer end cover and the inner end cover both abut against the bearings. The inner end cover is just located in the bearing groove of the drum unit, and the inner end cover does not protrude from the outer surface of the drum unit. The shaft ring is located on the inner side of the outer end cover, and the inner end cover and the outer end cover are both connected to the drum unit by screws.

4. The optical cable laying and recovery device for a cable-laying vessel according to claim 1, characterized in that: The support ring includes an inner ring support ring and an outer ring support ring. The inner ring support ring is close to the surface of the central axis. The outer ring support ring is located outside the inner ring support ring and is concentric with the inner ring support ring. Both ends of the inner ring support ring and the outer ring support ring are abutted on the bearing, and an oil chamber is formed between the inner ring support ring, the outer ring support ring and the bearing.

5. The optical cable laying and recovery device for a cable-laying vessel according to claim 4, characterized in that: The oil supply channel is in an inverted L shape, one end of the oil supply channel is connected to the center of the end of the central shaft, and the other end is connected to the oil cavity. A pipe joint is also provided on the oil supply channel outside the central shaft.

6. The optical cable laying and recovery device for a cable-laying vessel according to claim 1, characterized in that: The roller monomers are symmetrical to each other and do not contact each other. The roller monomers are all provided with radial pulley spokes. The roller monomers are edgeless pulleys. A lifting ring is provided on the shaft support seat. The shaft support seat is connected to the stern deck through a bolt group. The roller monomer is located in a groove formed by the hull structure on both sides of the stern circular groove.

7. The optical cable laying and recovery device for a cable-laying vessel according to claim 6, characterized in that: The hinged protection rod is located above the stern circular groove, and a hinged protection rod stopper is respectively arranged at the working position and the standby position of the hinged protection rod, and the hinged protection rod stopper plays a role of limiting and stopping the hinged protection rod.

8. The optical cable laying and recovery device for a cable-laying vessel according to claim 7, characterized in that: The standby position is a hinged protection rod located on one side of the drum unit and parallel to the roller unit, and the working position is a hinged protection rod spanning the drum unit and vertical thereto in space.

9. The working method of the optical cable laying and recovery device of a cable-laying vessel according to claim 1, characterized in that: The following steps are involved: A. The method of laying submarine optical cables includes the following steps: Step 1: Bury the plow shift There is no need to use an embedded plow in this working condition, so it is hoisted to the standby position; Step 2: Put the protective rod in place Turn the hinged protection bar 90° counterclockwise from the standby position to the working position; Step 3: Submarine cable in place The submarine optical cable is transported from the cable trough to the location of the optical cable laying and recovery device; Step 4: Submarine cable laying The submarine cable runs along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located, and naturally falls from the stern to the seabed. The cable-laying ship uses the laying and recovery device to transport the optical cable while moving, and continuously carries out the surface laying of the submarine cable; Step 5: Submarine cable laying completed When the optical cable laying task of the preset laying route is completed, the submarine optical cable laying work is ended, and the hinged protection rod is rotated 90° clockwise to the standby position of the hinged protection rod stopper; B. The optical cable burial method includes the following steps Step 1: Lay the umbilical cable and lay it out Before starting the work, it is necessary to use the burying plow umbilical cable winch to release the cable and connect the burying plow umbilical cable to the burying plow 300; Step 2: Put the protective rod in place Turn the hinged protection bar 90° counterclockwise from the hinged protection bar stopper in the standby position to the working position; Step 3: Submarine cable in place The submarine cable is transported from the cable trough to the location of the cable laying and recovery device. The submarine cable travels along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located; Step 4: Set the plow in place S1: Lead the submarine optical cable that slides out from the stern pulley to the designated working position on the burying plow; S2: Use the A-frame of the burying plow to hoist the burying plow from the standby position to the sea surface at the stern of the ship, and prepare to put the burying plow into the water; S3: The burying plow carries the burying plow umbilical cable and the submarine optical cable into the water and reaches the seabed working position; Step 5: Submarine cable laying The cable-laying ship moves forward, driving the burying plow to dig trenches and start burying work. The cable-laying ship uses the laying and recovery device to transport the optical cable to the burying plow while moving forward, so that the submarine burying work of the submarine optical cable can be carried out continuously; Step 6: Submarine cable laying completed When the optical cable burial task of the preset burial route is completed, the submarine optical cable burial work is ended, and the hinged protection rod is rotated 90° clockwise to the standby position; C. The method for recovering submarine optical cables comprises the following steps: Step 1: Bury the plow shift There is no need to use an embedded plow in this working condition, so it is hoisted to the standby position; Step 2: Put the protective rod in place Turn the hinged protection bar 90° counterclockwise from the standby position to the working position; Step 3: Recycling Preparation The cable head of the submarine cable to be recovered is pulled to the stern laying and recovery device. The submarine cable moves along the wheel surface of the stern pulley in the groove formed by the stern pulley and the hull structure on both sides of the circular groove where it is located, and the cable head is pulled to the ship-borne cable recovery power equipment; Step 4: Recycling submarine cables The optical cable recovery power equipment provides traction to continuously recover the optical cables to be recovered; Step 5: Submarine cable recycling ends When all the optical cables to be recovered are recovered on board, the submarine optical cable recovery work is completed, and the hinged protection rod is rotated 90° clockwise to the standby position.

10. The working method of the optical cable laying and recovery device of a cable-laying vessel according to claim 9, characterized in that: The outdoor cable trough is located on the hull structure, the laying and recovery device is located on one side of the outdoor cable trough, and the other side of the outdoor cable trough is a burying plow towing winch. A burying plow umbilical cable winch is arranged above the laying and recovery device, and the burying plow umbilical cable winch is provided with a burying plow and a burying plow A-frame.

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