A motion compensation type submarine cable laying system

Abstract

The present invention discloses a motion compensation type submarine cable laying system, which relates to the technical field of submarine cable laying devices. It solves the problems that the laying ship generates periodic heaving under the action of waves, which easily affects the cable laying and causes cable damage. The existing submarine cable laying needs to select a time when the sea surface is relatively calm, resulting in limited laying work and delaying the construction period. The system includes a ground turntable and a conveying frame body. One end of the conveying frame body is hinged to the hull, and the other end is provided with a compensation driving member for driving the free end to swing up and down. A number of steering devices are also provided on the conveying frame body. The submarine cable is stored on the ground turntable, and after passing through a number of steering devices and winding around several circles, it leaves the hull from the free end of the conveying frame body for laying. It can reduce the influence caused by the continuous heaving of the hull by waves, and by winding and untwisting the submarine cable multiple times, the laying effect is improved and the construction period is accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable laying devices, and particularly relates to a motion compensation type submarine cable laying system. Background Art

[0002] Submarine cables, also known as submarine cables, are cables wrapped with insulating materials and laid on the seabed for telecommunication transmission. They can be divided into submarine power cables and submarine communication cables. When laying submarine cables, it is necessary to control the sailing speed of the laying ship and the cable release speed to control the cable's entry angle into the water and the laying tension, so as to avoid damaging the cable due to too small a bending radius or too large a tension; it is also necessary to continuously monitor and adjust the forward speed, direction of the laying ship, and the speed of laying the cable to avoid uneven places and rocks to prevent cable damage. However, due to the periodic heaving of the laying ship caused by the action of waves, it is easy to affect the cable laying and cause cable damage. Therefore, the existing submarine cable laying needs to be carried out at a time when the sea surface is relatively calm, which limits the laying work and delays the construction period. Summary of the Invention

[0003] The purpose of the present invention is to provide a motion compensation type submarine cable laying system, which can reduce the influence caused by the continuous heaving of the hull due to waves, and improve the laying effect and speed up the construction period by winding and untwisting the submarine cable multiple times.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions:

[0005] A motion compensation type submarine cable laying system includes a ground turntable and a conveying frame. One end of the conveying frame is hinged to the hull, and the other end is provided with a compensation driving member for driving the free end to swing up and down; a plurality of steering devices are also provided on the conveying frame. The submarine cable is stored in the ground turntable, passes through a plurality of steering devices and winds around several circles, and then leaves the hull from the free end of the conveying frame for laying.

[0006] Furthermore, the compensation driving member includes a plurality of lifting hydraulic cylinders. The cylinder body of the lifting hydraulic cylinder is hinged to the hull / conveying frame, and the output shaft is hinged to the conveying frame / hull.

[0007] Furthermore, the steering device includes a plurality of arc guiding members distributed up and down. The submarine cable passes through each arc guiding member from bottom to top in turn for reciprocating steering and winds around several circles for untwisting.

[0008] Furthermore, the arc guiding member includes an arc-shaped skeleton detachably connected to the conveying frame. The cross-section of the arc-shaped skeleton is C-shaped, and the inside is used for threading the submarine cable. A plurality of limiting blocks are distributed along the circumference on the bottom plate of the arc-shaped skeleton, and the limiting blocks limit the outside of the submarine cable.

[0009] Furthermore, a guiding chain is detachably connected inside the arc-shaped framework. The guiding chain includes a number of sequentially connected chain links. The inner side of the chain links abuts against the inner side wall of the arc-shaped framework. A number of vertical guiding rollers are also connected to the chain links. The outer peripheral part of the guiding rollers protrudes out of the outer side of the chain links and abuts against the inner side of the submarine cable.

[0010] Furthermore, the diameter of the guiding rollers decreases from both ends towards the middle, forming a middle depression; the outer periphery of the submarine cable abuts against the depression of the guiding rollers.

[0011] Furthermore, there are two arc-shaped guiding members. One is installed on the lower side of the conveying frame body, at one end of the conveying frame body close to the compensation driving member, and the other is installed on the upper side of the conveying frame body, at one end of the conveying frame body close to its hinge shaft.

[0012] Furthermore, slide rails and sliding plates sliding along the slide rails are respectively arranged on the upper and lower sides of the conveying frame body. The arc-shaped guiding members are detachably installed on the corresponding sliding plates, and the sliding plates are fixed to the conveying frame body by bolts.

[0013] Furthermore, a first guiding wheel is connected to the hull, a second guiding wheel is connected to the conveying frame body, the submarine cable between the ground turntable and the lower arc-shaped guiding member abuts above the first guiding wheel, and the submarine cable between the lower arc-shaped guiding member and the upper arc-shaped guiding member abuts above the second guiding wheel.

[0014] Furthermore, a lifting compensation device for driving the first guiding wheel to move up and down is also connected to the hull. When the compensation driving member drives the outer end of the conveying frame body to swing up and down, the lifting compensation device drives the first guiding wheel to swing up and down correspondingly.

[0015] Furthermore, a pulling device for driving the laying of the submarine cable is also connected to the conveying frame body. The pulling device includes two upper and lower conveying devices. The submarine cable is threaded between the two conveying devices, and the submarine cable is pulled forward by the simultaneous conveyance of the conveying devices.

[0016] Furthermore, a conveying lifting mechanism and a transmission guiding track are connected to the conveying frame body. The upper conveying device is driven to lift by the conveying lifting mechanism and guided to lift by the transmission guiding track.

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

[0018] The influence caused by the continuous heaving of the hull under the action of waves is reduced by the compensation driving member, and in cooperation with the lifting compensation device, it is avoided that the submarine cable is damaged due to too small bending radius or too large tension during laying and compensation;

[0019] And the submarine cable is twisted back and forth by multiple circumferences through the arc-shaped guiding members to improve the laying effect;

[0020] The sliding plate can move the arc-shaped skeleton to different positions to adapt to the ground turntables at different positions on different hulls. The detachable arc-shaped skeleton and the internally detachable guiding chain can adapt to submarine cables with different bending radius requirements, limit the submarine cable between the guiding chain and the guiding block, and improve the stability of the submarine cable winding operation. Description of the Drawings

[0021] Figure 1 is the overall structural schematic diagram of the present invention;

[0022] Figure 2 is the top view of the overall structure of the present invention;

[0023] Figure 3 is the structural schematic diagram of the arc-shaped guiding member in the present invention;

[0024] Figure 4 is Figure 3 the sectional view taken along A-A;

[0025] Figure 5 is the structural schematic diagram of another specification of the arc-shaped guiding member;

[0026] Figure 6 is the structural schematic diagram of the pulling device in the present invention.

[0027] In the figure, 1, ground turntable; 2, conveying frame body; 21, lifting hydraulic cylinder; 22, cross beam; 23, vertical beam; 24, connecting beam; 3, arc-shaped guiding member; 31, arc-shaped skeleton; 32, limiting block; 4, guiding chain; 41, chain link; 42, guiding roller; 43, chain fixing bolt; 5, sliding plate; 61, first guiding wheel; 62, second guiding wheel; 7, lifting compensation device; 8, pulling device; 81, conveying device; 82, conveying lifting mechanism; 83, driving guiding track. Detailed Embodiment

[0028] The following further describes the detailed embodiment of the present invention in conjunction with the drawings. This embodiment does not constitute a limitation to the present invention.

[0029] A motion compensation type submarine cable laying system, as Figure 1 shown, includes a ground turntable 1 and a conveying frame body 2. The ground turntable 1 stores and releases and lays the submarine cable by rotation. One end of the conveying frame body 2 is hinged to the hull, and the other end is provided with a compensation driving member for driving the free end to swing up and down. According to the up and down undulation of the ship's stern following the waves, the compensation driving member drives the tail end of the conveying frame body 2 to move up and down correspondingly for compensation, so as to ensure that the height position of the submarine cable leaving the hull remains unchanged;

[0030] In this embodiment, the ground turntable 1 is installed inside the hull, and the submarine cable is laid through the conveying frame 2 after passing through the deck; the compensation driving member includes two lifting hydraulic cylinders 21. The cylinder body of the lifting hydraulic cylinder 21 is hinged to the conveying frame 2, and the output shaft is hinged to the hull. The compensation driving member can also be replaced by other power devices that drive the free end of the conveying frame 2 to swing up and down.

[0031] As Figure 1 and Figure 2 shown, a mounting seat is pre-installed at the front end of the hull for mounting the hinge seat at one end of the conveying frame 2, and two hinge seats are symmetrically preset at the tail of the hull for hinging the output ends of the lifting hydraulic cylinders 21.

[0032] The conveying frame 2 includes two cross beams 22, multiple connecting beams 24 vertically welded between the two cross beams 22, and vertical beams 23 welded to the outermost ends of the cross beams 22. The two ends of the vertical beams 23 are respectively hinged to the cylinder bodies of the corresponding lifting hydraulic cylinders 21.

[0033] On both sides of one end of the cross beam 22 close to the lifting hydraulic cylinder 21, there are also symmetrically connected transverse conveying tracks for guiding the submarine cable to leave. On the vertical beams 23, there are symmetrically fixed cable-laying tracks whose track width gradually expands towards the outer end. The cable-laying tracks gradually point downward towards the seabed along the horizontal direction of the transverse conveying tracks. According to the winding direction in the ground turntable 1 and the number of winding circles in the conveying frame 2, the submarine cable finally leaves from one side of the transverse conveying tracks and the cable-laying tracks for underwater laying work.

[0034] As Figure 1 shown, there are also several steering devices on the conveying frame 2. The submarine cable is stored in the ground turntable 1, passes through multiple steering devices and winds around several circles, and then leaves the hull from the free end of the conveying frame 2 for laying; the steering devices include several arc guiding members 3 distributed up and down. The submarine cable passes through each arc guiding member 3 from bottom to top in turn for reciprocating steering and winds around several circles for untwisting.

[0035] In this embodiment, there are two arc guiding members 3. One is installed on the lower side of the conveying frame 2, at one end of the conveying frame 2 close to the lifting hydraulic cylinder 21, and the other is installed on the upper side of the conveying frame 2, at one end of the conveying frame 2 close to its hinge shaft.

[0036] As Figure 3 and Figure 4 shown, in order to improve the guiding and limiting effects on the submarine cable, the arc guiding member 3 includes an arc-shaped skeleton 31 detachably connected to the conveying frame 2. The cross-section of the arc-shaped skeleton 31 is C-shaped, and the inside is used for threading the submarine cable. The two ends can be connected with outwardly expanding bell mouths to guide the submarine cable to enter. Along the circumferential direction on the bottom plate of the arc-shaped skeleton 31, there are several limiting blocks 32. The limiting blocks 32 are limited to the outside of the submarine cable to form an arc-shaped channel for the submarine cable to pass through and fold back.

[0037] AsFigure 3 and Figure 5 As shown in Figure 5 , a guiding chain 4 is detachably connected inside the arc-shaped framework 31. The guiding chain 4 includes a plurality of chain links 41 connected in sequence. The inner sides of the chain links 41 are abutted against the inner side wall of the arc-shaped framework 31. A plurality of vertical guiding rollers 42 are further connected to the chain links 41. The outer peripheral portions of the guiding rollers 42 protrude out of the outer sides of the chain links 41 and are abutted against the inner side of the submarine cable.

[0038] The diameter of the guiding roller 42 decreases from both ends to the middle direction, forming a middle depression. The outer periphery of the submarine cable is abutted against the depression of the guiding roller 42 under the action of tension. Fixing bolts 43 for the chain are fixed at both ends of the arc-shaped framework 31, and the two ends of the guiding chain 4 are fixed by inserting the fixing bolts 43 for the chain.

[0039] In this embodiment, there is a slight gap between the bottom plate of the limiting block 32 and the submarine cable. In the laying state, the submarine cable is tightly abutted against the outer peripheral depression of the guiding roller 42 by the tension, and the deviation of the submarine cable under its own weight is avoided by the bottom plate of the limiting block 32, and the outer side of the submarine cable is limited by the upper part of the limiting block 32.

[0040] As Figure 2 and Figure 3 shown in Figure 3 , in order to facilitate the adjustment of the positions of the two arc-shaped frameworks 31 according to the position of the ground turntable 1 on the hull, slide rails and sliding plates 5 sliding along the slide rails are respectively arranged on the upper and lower sides of the conveying frame body 2. The arc-shaped guiding members 3 are detachably installed on the corresponding sliding plates 5 through bolts, and the sliding plates 5 are fixed on one or two connecting beams 24 at the corresponding positions of the conveying frame body 2 through bolts.

[0041] As Figure 1 shown in Figure 1 , in order to guide the submarine cable to enter the two arc-shaped guiding members 3 in sequence, a first guiding wheel 61 is connected to the hull, and one or two second guiding wheels 62 are connected to the conveying frame body 2. The submarine cable between the ground turntable 1 and the lower arc-shaped guiding member 3 is abutted above the first guiding wheel 61, and the submarine cable between the lower arc-shaped guiding member 3 and the upper arc-shaped guiding member 3 is abutted above the second guiding wheel 62 or between the two second guiding wheels 62. The submarine cable starts from the ground turntable 1, is guided by the first guiding wheel 61 and enters the lower arc-shaped guiding member 3 at an angle close to horizontal for turning. The turned submarine cable is guided by the second guiding wheel 62 and enters the upper arc-shaped guiding member 3 at an angle close to horizontal for turning, and finally extends out of the hull for laying.

[0042] As Figure 1 shown in Figure 1 , a lifting compensation device 7 for driving the first guiding wheel 61 to move up and down is further connected to the hull. The lifting compensation device 7 can be a lifting device such as a hydraulic cylinder, and its output end can also improve safety through a buffer device. When the compensation driving member drives the outer end of the conveying frame body 2 to swing up and down, the lifting compensation device 7 drives the first guiding wheel 61 to swing up and down correspondingly, so as to avoid excessive stretching or detachment of the submarine cable at the position of the first guiding wheel 61 during compensation.

[0043] As Figure 2 shown, a pulling device 8 for driving the laying of the submarine cable is also connected to the conveying frame body 2. In this embodiment, a mounting base plate is fixed to the bottom of the conveying frame body 2. The pulling device 8 and the second guide wheel 62 are installed and fixed on the corresponding two sides of the mounting base plate according to the winding direction of the submarine cable in the ground turntable 1. The mounting base plate is reinforced by horizontal and longitudinal channel steels;

[0044] As Figure 6 shown, the pulling device 8 includes two upper and lower conveying devices 81. The submarine cable is threaded between the two conveying devices 81. The submarine cable is pulled forward by the simultaneous transmission of the conveying devices 81. The conveying device 81 is a chain plate conveyor belt. Friction plates are fixed on the outside of each chain plate. A V-shaped groove is provided in the middle of the outside of the friction plate along the length direction of the machine body. A plurality of abutting rollers are also connected to the inner side of the chain plate conveyor belt. The abutting rollers abut against the inner side of the chain plate, so that the distance between the mutually approaching sides of the two chain plate conveyor belts is kept fixed under the action of the abutting rollers. The opposite friction plates on the two upper and lower conveying devices 81 abut against the outer circumference of the submarine cable. The V-shaped groove helps to increase the friction area and pull the submarine cable forward by friction;

[0045] A conveying lifting mechanism 82 and a transmission guiding track 83 are connected to the mounting base plate of the conveying frame body 2. The upper conveying device 81 is driven to lift by the conveying lifting mechanism 82 and guided to lift by the transmission guiding track 83. The conveying lifting mechanism 82 can be an existing lifting device such as a hydraulic cylinder. The transmission track can be set as an existing guiding track such as a T-shaped groove. The upper conveying device 81 moves up and down along the transmission guiding track 83 through the side T-shaped block, ensuring that the distance between the two conveying devices 81 before and after the movement is uniform, and making the force on the submarine cable more uniform.

[0046] The above is only a preferred embodiment of the present invention and is not used to limit the present invention. Those skilled in the art can make various modifications or equivalent replacements to the present invention within the essence and protection scope of the present invention. Such modifications or equivalent replacements should also be regarded as falling within the protection scope of the technical solution of the present invention.

Claims

1. A motion compensation type submarine cable laying system, characterized in that: It includes a turntable and a conveying frame. One end of the conveying frame is hinged to the hull, and the other end is provided with a compensation driving member for driving the free end of the conveying frame to swing up and down. A number of steering devices are also provided on the conveying frame. The submarine cable is stored on the turntable, and after passing through a number of steering devices and winding around several circles, it leaves the hull from the free end of the conveying frame for laying. The steering device includes a number of arc-shaped guiding members distributed up and down. The submarine cable passes upward through each arc-shaped guiding member from the turntable in turn for reciprocating steering and winding around several circles for untwisting. There are two arc-shaped guiding members. One is installed on the lower side of the conveying frame, near the end of the conveying frame close to the compensation driving member, and the other is installed on the upper side of the conveying frame, near the end of the conveying frame close to its hinge axis. A first guiding wheel is connected to the hull, and a second guiding wheel is connected to the conveying frame. The submarine cable between the turntable and the lower arc-shaped guiding member abuts above the first guiding wheel, and the submarine cable between the lower arc-shaped guiding member and the upper arc-shaped guiding member abuts above the second guiding wheel. An elevating compensation device for driving the first guiding wheel to move up and down is also connected to the hull. When the compensation driving member drives the outer end of the conveying frame to swing up and down, the elevating compensation device drives the first guiding wheel to swing up and down correspondingly.

2. The motion compensation type submarine cable laying system according to claim 1, wherein: The compensation driving member includes a number of lifting hydraulic cylinders. The cylinder body of the lifting hydraulic cylinder is hinged to the hull / conveying frame, and the output shaft is hinged to the conveying frame / hull.

3. The motion compensation type submarine cable laying system according to claim 1, characterized in that: The arc-shaped guiding member includes an arc-shaped skeleton detachably connected to the conveying frame. The cross-section of the arc-shaped skeleton is C-shaped, and the inside is used for threading the submarine cable. A number of limiting blocks are distributed circumferentially on the bottom plate of the arc-shaped skeleton, and the limiting blocks limit the outside of the submarine cable.

4. The motion compensation type submarine cable laying system according to claim 3, characterized in that: A guiding chain is detachably connected inside the arc-shaped skeleton. The guiding chain includes a number of sequentially connected chain links. The inner side of the chain link abuts against the inner side wall of the arc-shaped skeleton, and a number of vertical guiding rollers are also connected in the chain link. The outer peripheral part of the guiding roller protrudes outside the chain link and abuts against the inner side of the submarine cable.

5. A motion compensation type submarine cable laying system according to claim 4, characterized in that: The diameter of the guiding roller decreases from both ends to the middle direction, forming a middle depression. The outer periphery of the submarine cable abuts in the depression of the guiding roller.

6. The motion compensation type submarine cable laying system according to claim 1, wherein: Sliding rails and sliding plates sliding along the sliding rails are respectively provided on the upper and lower sides of the conveying frame. The arc-shaped guiding member is detachably installed on the corresponding sliding plate, and the sliding plate is fixed to the conveying frame by bolts.

7. A motion compensation type submarine cable laying system according to claim 1, characterized in that: A pulling device for driving the submarine cable to be laid is also connected to the conveying frame. The pulling device includes two conveying devices, upper and lower. The submarine cable is threaded between the two conveying devices, and the submarine cable is pulled forward by the simultaneous conveyance of the conveying devices.

8. A motion compensation type submarine cable laying system according to claim 7, characterized in that: A conveying lifting mechanism and a transmission guiding track are connected to the conveying frame. The upper conveying device is driven to lift by the conveying lifting mechanism and guided to lift by the transmission guiding track.

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