A mobile counterweight system for mooring cables

Abstract

The present invention relates to the technical field of mooring system structures, and specifically to a movable counterweight block system suitable for mooring cables, including an FPSO and a mooring cable on the FPSO, wherein the mooring cable is provided with multiple buoyancy blocks at a location away from the FPSO, the mooring cable is sleeved with multiple counterweight blocks, at least one linear motor and multiple fixing devices are provided inside the mooring cable, the linear motor is provided with multiple sliders, the fixing device is provided with at least two supporting magnets around, and the inner wall of the counterweight block is pierced with guide magnets corresponding to all the supporting magnets one by one. According to the sea conditions, the linear motor is controlled to move the slider, which drives the fixing device to move, which drives the supporting magnet to move, which drives the guide magnet to move, and which drives the counterweight block to move by the guide magnet, thereby adjusting the distance between the counterweight block and the buoyancy block to ensure the tension of the mooring cable.

Description

Technical Field

[0001] The present invention relates to the technical field of mooring system structures, and in particular to a movable counterweight system suitable for mooring cables. Background Art

[0002] Mooring systems consist of cables, surface mechanisms, and seabed fixtures. Floating structures undergo heave and sink motions under environmental loads. This motion is transmitted to the cables through the mechanisms, causing them to vibrate violently. Currently, catenary cables and buoys are commonly used to minimize the impact of the mooring cable's movement as it follows the structure's movements.

[0003] With the development of urbanization and industrialization, severe situations at sea occur frequently, and underwater conditions are difficult to predict and control. In order to improve the pull-out resistance of the mooring cable, weights are installed on the mooring cable. For example, the publication number CN1843839A proposes an invention patent for an offshore floating positioning combined mooring cable, which is characterized in that it includes an anchor chain connected to an offshore floating body at one end, and the other end of the anchor chain is connected to an anchoring device fixed to the seabed, a group of weights are arranged at intervals on the anchor chain below the sea surface, the anchor chain is connected to the side wall of the anchoring device, and the anchor chain with one end connected to the side wall of the anchoring device is buried in the seabed.

[0004] However, when the ocean current is unstable, if the counterweight on the mooring cable is not in the optimal position, the mooring cable will exceed its own tension range, making the mooring cable vulnerable to damage. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to propose a movable counterweight system suitable for mooring cables, so as to solve the problem that when the counterweight on the mooring cable is not in the optimal solution position, the mooring cable will exceed its own tension range, making the mooring cable susceptible to damage.

[0006] To achieve the above objectives, the present invention provides a mobile counterweight system suitable for a mooring cable, comprising an FPSO, wherein the FPSO is provided with a mooring cable, wherein a plurality of buoyancy blocks are provided at a location of the mooring cable away from the FPSO, wherein a plurality of counterweight blocks are sleeved on the mooring cable, wherein at least one linear motor and a plurality of fixing devices are provided inside the mooring cable, wherein the linear motor is provided with a plurality of sliders corresponding one-to-one to all the counterweight blocks, wherein each slider is fixedly connected to a fixing device, and wherein at least two supporting magnets are provided around the fixing device, and wherein the two supporting magnets are fixedly connected to one side of the fixing device in an opposing state.

[0007] The inner wall of the counterweight block is provided with guide magnets corresponding to all the supporting magnets one by one. One side of each guide magnet is arranged in contact with the mooring cable, and each guide magnet is magnetically connected to the supporting magnet.

[0008] Preferably, an anti-lateral shift device is provided on the side of the supporting magnet, and each of the anti-lateral shift devices is used to apply a repulsive force to the guide magnet so that the guide magnet cannot escape from the range of mutual attraction with the supporting magnet.

[0009] Preferably, a wave energy power generation device is provided inside the mooring cable, the wave energy power generation device is electrically connected to the linear motor, and the wave energy power generation device is used to convert wave energy in seawater into electrical energy.

[0010] Preferably, an ultrasonic sensor is provided inside the mooring cable, the ultrasonic sensor is electrically connected to the wave energy power generation device, and the ultrasonic sensor is used to receive information about the sea conditions around the mooring cable.

[0011] Preferably, a rotor is provided inside the fixing device, the rotor being electrically connected to the wave energy power generation device, the rotor being used to generate a rotating magnetic field, a plurality of eddy current brake devices being provided on the inner wall of the counterweight block and being staggered with all the guide magnets, one side of the eddy current brake device being provided in contact with the mooring cable, and the eddy current brake device being used to clamp the mooring cable to secure the counterweight block to the mooring cable;

[0012] Among them, a rotating magnetic field is formed by the rotation of the rotor and the support magnet. The eddy current brake device works under the influence of the rotating magnetic field, contacting the mooring cable to clamp it so that the counterweight block can move on the mooring cable.

[0013] Preferably, the rotor comprises a long stator core and a copper wire group, the long stator core is rotatably connected and arranged in the fixing device, and the copper wire group is wound on the long stator core.

[0014] Preferably, a first spring is inserted into a side of the eddy current brake device away from the mooring cable, and two ends of the first spring respectively abut against the outer walls of the eddy current brake device and the counterweight block.

[0015] Preferably, a second spring is inserted into the side of the guide magnet away from the mooring cable, and two ends of the second spring respectively abut against the outer wall of the guide magnet and the counterweight block.

[0016] Preferably, the mooring cable is made of high-performance composite fiber material.

[0017] The beneficial effects of the present invention are as follows: according to the sea conditions, the linear motor is controlled to move the slider, the fixing device is driven to move by the slider, the supporting magnet is driven to move by the fixing device, the guide magnet is driven to move by the supporting magnet, and the counterweight block is driven to move by the guide magnet, thereby adjusting the distance between the counterweight block and the buoyancy block to ensure the tension of the mooring cable. When the counterweight block on the mooring cable is not in the optimal solution position, the mooring cable will exceed its own tension range, making the mooring cable susceptible to damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the cross-sectional structure of a mooring cable according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of a counterweight according to an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the internal structure of the counterweight block according to an embodiment of the present invention.

[0023] The following are marked in the figure:

[0024] 1. FPSO; 2. Mooring line; 3. Buoyancy block; 4. Counterweight block; 5. Linear motor; 6. Fixing device; 7. Slider; 8. Support magnet; 9. Guide magnet; 10. Anti-side shift device; 11. Wave energy power generation device; 12. Ultrasonic sensor; 13. Eddy current brake device; 14. Long stator core; 15. Copper wire group; 16. First spring; 17. Second spring. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0026] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] like Figures 1 to 4 As shown, a mobile counterweight system suitable for a mooring cable includes an FPSO 1, a mooring cable 2 is provided on the FPSO 1, a plurality of buoyancy blocks 3 are provided on the mooring cable 2 at a location away from the FPSO 1, a plurality of counterweight blocks 4 are sleeved on the mooring cable 2, at least one linear motor 5 and a plurality of fixing devices 6 are provided inside the mooring cable 2, a plurality of sliders 7 are provided on the linear motor 5, corresponding one-to-one to all the counterweight blocks 4, each of the sliders 7 is fixedly connected to the fixing device 6, and at least two supporting magnets 8 are provided around the fixing device 6, and the two supporting magnets 8 are fixedly connected to one side of the fixing device 6 in an opposing state;

[0028] The inner wall of the counterweight block 4 is provided with guide magnets 9 corresponding to all the supporting magnets 8 one by one. One side of each guide magnet 9 is arranged in contact with the mooring cable 2, and each guide magnet 9 is magnetically connected to the supporting magnet 8 respectively.

[0029] For example, according to the sea conditions, the linear motor 5 is controlled to move the slider 7, which drives the fixing device 6 to move, which drives the supporting magnet 8 to move, which drives the guide magnet 9 to move, and which drives the counterweight block 4 to move, thereby adjusting the distance between the counterweight block 4 and the buoyancy block 3 to ensure the tension of the mooring cable 2. This solves the problem that when the counterweight block 4 on the mooring cable 2 is not in the optimal solution position, the mooring cable 2 will exceed its own tension range, making the mooring cable 2 susceptible to damage.

[0030] As an optional embodiment, an anti-lateral displacement device 10 is provided on the side of the supporting magnet 8, and each anti-lateral displacement device 10 is used to apply a repulsive force to the guide magnet 9 so that the guide magnet 9 cannot escape the range of mutual attraction with the supporting magnet 8.

[0031] As an optional embodiment, a wave energy power generation device 11 is provided inside the mooring cable 2 , the wave energy power generation device 11 is electrically connected to the linear motor 5 , and the wave energy power generation device 11 is used to convert wave energy in seawater into electrical energy.

[0032] As an optional embodiment, an ultrasonic sensor 12 is provided inside the mooring cable 2 , the ultrasonic sensor 12 is electrically connected to the wave energy power generation device 11 , and the ultrasonic sensor 12 is used to receive information about the sea conditions surrounding the mooring cable 2 .

[0033] For example, the ultrasonic sensor 12 receives information about the sea conditions around the mooring cable 2, processes the received information and feeds it back to the control system, which analyzes it. After analysis, the control system sends a control signal to the wave energy power generation device 11 and the linear motor 5, thereby controlling the operation of the wave energy power generation device 11 and controlling the linear motor 5 to move forward and reverse or stop working.

[0034] As an optional embodiment, a rotor is provided inside the fixing device 6, and the rotor is electrically connected to the wave energy generator 11. A plurality of eddy current brake devices 13 are provided on the inner wall of the counterweight 4, and are staggered with all the guide magnets 9. One side of the eddy current brake device 13 is attached to the mooring cable 2, and the eddy current brake device 13 is used to clamp the mooring cable 2 to fix the counterweight 4 to the mooring cable 2.

[0035] The rotor rotates to form a rotating magnetic field in cooperation with the supporting magnet 8 , and the eddy current brake device 13 works under the influence of the rotating magnetic field, contacting and clamping the mooring cable 2 so that the counterweight 4 can move on the mooring cable 2 .

[0036] As an optional embodiment, the rotor includes a long stator core 14 and a copper wire group 15 . The long stator core 14 is rotatably connected and disposed in the fixing device 6 , and the copper wire group 15 is wound around the long stator core 14 .

[0037] For example, in order to prevent the counterweight 4 from being affected by seawater and deviating from the specified position of the optimal solution, an eddy current brake device 13 is provided to clamp the mooring cable 2, so that the counterweight 4 is fixed on the mooring cable 2. When the counterweight 4 needs to be moved to adjust its position, a long stator core 14 is provided inside the fixing device 6, and a copper wire group 15 is wound on the long stator core 14. According to the power provided by the wave energy power generation device 11, the long stator core 14 drives the copper wire group 15 to rotate, and cooperates with the supporting magnet 8 to form a rotating magnetic field. The eddy current brake device 13 is affected by the rotating magnetic field and works to clamp the mooring cable 2. It works through the DC motor, so that the counterweight 4 can move on the mooring cable 2, thereby achieving the problem of braking and fixing the counterweight 4.

[0038] As an optional embodiment, a first spring 16 is inserted into the side of the eddy current brake device 13 away from the mooring cable 2 , and both ends of the first spring 16 respectively press against the outer walls of the eddy current brake device 13 and the counterweight 4 .

[0039] For example, by arranging the first spring 16 between the eddy current brake device 13 and the outer wall of the counterweight 4 , the friction force of the eddy current brake device 13 moving on the mooring cable 2 is reduced.

[0040] As an optional embodiment, a second spring 17 is inserted into the side of the guide magnet 9 away from the mooring cable 2 , and two ends of the second spring 17 respectively abut against the outer walls of the guide magnet 9 and the counterweight 4 .

[0041] For example, by arranging the second spring 17 between the guide magnet 9 and the outer wall of the counterweight 4 , the friction force generated when the guide magnet 9 moves on the mooring cable 2 is reduced.

[0042] As an optional embodiment, the mooring line 2 is made of high-performance composite fiber material.

[0043] The main working principle of the present invention is as follows: an ultrasonic sensor 12 receives sea condition information, processes the information, and feeds it back to the control system. After analysis, the control system sends a control signal to the wave energy generator 11 and the linear motor 5, thereby controlling the operation of the wave energy generator 11 and controlling the linear motor 5 to move forward, reverse, or stop. The operation of the wave energy generator 11 converts wave energy in the seawater into electrical energy and drives the rotor to rotate within the fixing device 6, generating a rotating magnetic field. The vortex airflow brake is affected by the rotating magnetic field and operates to release the clamping of the mooring line 2. The linear motor 5 drives the fixing device 6 to move, which in turn drives the support magnet 8 to move. The support magnet 8 and the guide magnet 9 attract each other, causing the support magnet 8 to drive the guide magnet 9 to move. Anti-lateral movement devices 10 are provided on both sides of the support magnet 8 to apply a repulsive force to the guide magnet 9, preventing the guide magnet 9 from being affected by the flow of seawater and breaking away from the attractive force of the support magnet 8. The guide magnet 9 drives the counterweight 4 to move, thereby moving the counterweight 4 to the specified position as required, preventing the mooring line 2 from exceeding its own tension range and being damaged.

[0044] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0045] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mobile counterweight system for a mooring line, comprising an FPSO (1), a mooring line (2) provided on the FPSO (1), a plurality of buoyancy blocks (3) provided at a location of the mooring line (2) away from the FPSO (1), and a plurality of counterweight blocks (4) provided on the mooring line (2), wherein: At least one linear motor (5) and a plurality of fixing devices (6) are provided inside the mooring cable (2); a plurality of sliders (7) corresponding to all the counterweight blocks (4) are provided on the linear motor (5); each slider (7) is fixedly connected to the fixing device (6); at least two supporting magnets (8) are provided around the fixing device (6), and the two supporting magnets (8) are fixedly connected to one side of the fixing device (6) in an opposing state; The inner wall of the counterweight block (4) is provided with guide magnets (9) corresponding to all the supporting magnets (8) one by one, one side of each guide magnet (9) is arranged in contact with the mooring cable (2), and each guide magnet (9) is magnetically connected to the supporting magnet (8) respectively; A wave energy power generation device (11) is provided inside the mooring cable (2), the wave energy power generation device (11) is electrically connected to the linear motor (5), and the wave energy power generation device (11) is used to convert wave energy in seawater into electrical energy; A rotor is provided inside the fixing device (6), and the rotor is electrically connected to the wave energy power generation device (11). The rotor is used to generate a rotating magnetic field. A plurality of eddy current brake devices (13) are provided on the inner wall of the counterweight (4), which are staggered with all the guide magnets (9). One side of the eddy current brake device (13) is attached to the mooring cable (2), and the eddy current brake device (13) is used to clamp the mooring cable (2) so that the counterweight (4) is fixed to the mooring cable (2). The rotor rotates to form a rotating magnetic field in cooperation with the supporting magnet (8), and the eddy current brake device (13) operates under the influence of the rotating magnetic field, contacting and clamping the mooring cable (2) so that the counterweight (4) can move on the mooring cable (2).

2. A mobile counterweight system for mooring cables according to claim 1, characterized in that: An anti-lateral shift device (10) is provided on the side of each supporting magnet (8), and each anti-lateral shift device (10) is used to apply a repulsive force to the guide magnet (9) so that the guide magnet (9) cannot escape from the range of mutual attraction with the supporting magnet (8).

3. A mobile counterweight system for mooring cables according to claim 1, characterized in that: An ultrasonic sensor (12) is provided inside the mooring cable (2), the ultrasonic sensor (12) is electrically connected to the wave energy power generation device (11), and the ultrasonic sensor (12) is used to receive information about the sea conditions surrounding the mooring cable (2).

4. A mobile counterweight system for mooring cables according to claim 1, characterized in that: The rotor comprises a long stator core (14) and a copper wire group (15); the long stator core (14) is rotatably connected and arranged in the fixing device (6); and the copper wire group (15) is wound around the long stator core (14).

5. The mobile counterweight system for mooring cables according to claim 1, characterized in that: A first spring (16) is inserted into the side of the eddy current brake device (13) away from the mooring cable (2), and two ends of the first spring (16) respectively abut against the outer walls of the eddy current brake device (13) and the counterweight (4).

6. A mobile counterweight system for mooring cables according to claim 1, characterized in that: A second spring (17) is inserted into the side of the guide magnet (9) away from the mooring cable (2), and two ends of the second spring (17) respectively abut against the outer walls of the guide magnet (9) and the counterweight (4).

7. The mobile counterweight system for mooring cables according to claim 1, characterized in that: The mooring cable (2) is made of high-performance composite fiber material.

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