Mooring tensioning device applied to ocean engineering mooring system and control method of mooring tensioning device

Abstract

The invention discloses a mooring tensioning device applied to an ocean engineering mooring system and a control method of the mooring tensioning device. The device comprises a frame body structure, an electric cylinder, a damper, a pulley block, an anchor chain, a tension sensor and a fixing pile. The frame body structure comprises first and second fixed beams, first and second sliding beams and a guide rail assembly; the guide rail assembly is connected between the first and second fixed beams; the first fixed beam, the second fixed beam and the guide rail assembly are fixed on a floating structure; the first and second sliding beams are slidably connected to the guide rail assembly; the electric cylinder is connected between the first fixed beam and the first sliding beam; the damper is located between the first sliding beam and the second sliding beam. A fixed pulley of the pulley block is arranged on the second fixed beam, and a movable pulley is arranged on the second sliding beam; the fixed pile is fixed on a floating structure; one end of the anchor chain is fixed on the fixed pile, and the other end of the anchor chain is connected with the mooring rope through the tension sensor after alternately bypassing the fixed pulley and the movable pulley.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore floating wind power, and in particular to a mooring tensioning device applied to an offshore engineering mooring system and a constant tension control method thereof. Background Art

[0002] The development of marine resources depends on floating structures at sea with good positioning functions. Common mooring methods for floating structures at sea include catenary, semi-tensioned, tensioned, and hybrid. The catenary mooring system mainly uses the gravitational potential energy of the catenary to resist the work done by the horizontal environmental load on the structure, and generally has a large mooring radius; under extreme sea conditions, the floating structure will undergo large displacement and rapid motion oscillation, so the anchor chain has a large kinetic energy, which easily causes the catenary to tend to straighten and break. The tensioned mooring system often uses synthetic fiber materials or tendons with a small wet weight, which has the advantages of a small mooring radius, large horizontal restoring force, and small vertical load. However, the tension of the tensioned mooring cable is very large, and changes in small mooring parameters will cause changes in mooring performance, and the installation cost is very high. The hybrid mooring system uses two or more mooring methods to act on the floating structure at sea; or buoys and weights are set on the mooring cable to play a spring-like role to relieve the tension of the mooring cable. The semi-tensioned mooring system uses anchor chains and steel cables as mooring materials. The mooring radius is much smaller than that of catenary mooring, making it a preferred alternative to catenary mooring.

[0003] In order to avoid abnormal tension in the mooring cable and ensure the safety and economy of the floating structure, it is necessary to limit the lateral and longitudinal movement of the floating structure under the combined action of wind, waves and currents. Therefore, to eliminate the impact of movement on the mooring device, the mooring tension must be monitored and controlled in real time to ensure that the mooring system maintains a constant tension. Summary of the invention

[0004] The main purpose of the present invention is to provide a mooring tensioning device for use in an offshore engineering mooring system, which is used to maintain a constant tension of a mooring cable in the mooring system to avoid abnormal tension of the mooring cable.

[0005] To achieve the above object, the present invention proposes the following technical solutions:

[0006] A mooring tensioning device for an offshore engineering mooring system comprises a frame structure, an electric cylinder, a damper, a pulley block, an anchor chain, a tension sensor and a fixed pile; the frame structure comprises a first fixed beam, a second fixed beam, a first sliding beam, a second sliding beam and a guide rail assembly, wherein the guide rail assembly is connected between the first fixed beam and the second fixed beam; the first fixed beam, the second fixed beam and the guide rail assembly are fixed to a floating structure; the first sliding beam and the second sliding beam are slidably connected to the guide rail assembly; the first sliding beam is close to the first fixed beam, and the second sliding beam is close to the second fixed beam; the electric cylinder is connected between the first fixed beam and the first sliding beam; the damper is located between the first sliding beam and the second sliding beam; the fixed pulley of the pulley block is arranged on the second fixed beam, and the movable pulley is arranged on the second sliding beam; the fixed pile is fixed to the floating structure; one end of the anchor chain is fixed to the fixed pile, and the other end is connected to the mooring cable through the tension sensor after alternately passing around the fixed pulley and the movable pulley.

[0007] Furthermore, the guide rail assembly includes a guide rail frame and a guide rail, the guide rail frame is connected between the first fixed beam and the second fixed beam, and the guide rail is fixed on the guide rail frame.

[0008] Furthermore, the guide rail frame includes two parallel frame beams, and a guide rail is fixed on each frame beam.

[0009] Furthermore, the fixed end of the electric cylinder is connected to the first fixed beam, and the telescopic end is connected to the first sliding beam.

[0010] Furthermore, there are multiple groups of electric cylinders, all of which are arranged between the first fixed beam and the first sliding beam. The fixed ends of each group of electric cylinders are connected to the first fixed beam, and the telescopic ends are connected to the first sliding beam.

[0011] Furthermore, it also includes a chain guide; after the anchor chain alternately passes around the fixed pulley and the movable pulley, it passes through the chain guide and is connected to the mooring cable through the tension sensor.

[0012] Furthermore, there are a plurality of dampers; when the floating structure has a maximum displacement, the stroke of the damper has not yet reached a maximum value.

[0013] Furthermore, the number of the fixed pulleys is n, which are evenly fixed on the second fixed beam; the number of the movable pulleys is n-1, which are evenly fixed on the second sliding beam; the position of each movable pulley corresponds to the middle position of two adjacent fixed pulleys; n≥4.

[0014] Furthermore, a communication module is included for realizing remote control while remotely monitoring the offshore site.

[0015] The present invention further proposes a control method for the aforementioned mooring tensioning device, which is used to control the tension of the mooring tensioning device to be constant; the control method comprises: collecting the tension signal of the mooring cable in real time through the tension sensor, processing the tension signal through programmable logic control, converting the tension signal into an electric cylinder telescopic control instruction, and controlling the extension and contraction of the electric cylinder according to the electric cylinder telescopic control instruction; when the telescopic end of the electric cylinder is extended, the mooring cable is released, reducing the mooring tension; when the telescopic end of the electric cylinder is contracted, the mooring cable is shortened, increasing the mooring tension; thereby realizing the constant tension application of the mooring cable.

[0016] The beneficial effects of the technical solution of the present invention are embodied in:

[0017] 1) The mooring tensioning device of the present invention replaces the traditional tensioning devices such as anchor windlasses and winches, and realizes the tension application and control of mooring cables of various mooring systems such as semi-tensioning, tensioning, and hybrid types. The form of the mooring cable is not limited to steel wire ropes, fiber cables, etc.

[0018] 2) The mooring tensioning device of the present invention is combined with a tension sensor and a communication module to monitor and control the mooring tension in real time.

[0019] 3) The mooring tensioning device of the present invention actively adjusts the tension of the mooring cable through programmable logic control according to different sea conditions, reduces the movement amplitude of the floating structure, and achieves constant tension of the mooring cable, thereby avoiding overload failure of the mooring cable.

[0020] 4) The mooring tensioning device of the present invention adopts a passive tension adjustment method combining a damper and a pulley block, which can effectively reduce the rebound and twitching effect when the tension of the mooring cable suddenly changes, while increasing the feedback time of the heavy-load electric cylinder, making it easier to actively adjust the tension of the mooring cable.

[0021] In general, the present invention provides a mooring tensioning device for use in an offshore engineering mooring system, which can provide a constant tension for a mooring cable and can also be remotely monitored and controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a mooring tensioning device according to an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the application of the mooring tensioning device according to the embodiment of the present invention.

[0024] Figure 3 Schematic diagram of the frame structure of the mooring tensioning device according to an embodiment of the present invention.

[0025] Figure 4 It is a connection diagram of anchor chain, tension sensor and mooring cable.

[0026] Explanation of the reference numerals: 1-frame structure, 2-heavy-load electric cylinder, 3-damper, 4-pulley block, 5-anchor chain, 6-chain guide, 7-plate ring tension sensor, 8-mooring cable, 9-fixed pile, 11-first fixed beam, 12-second fixed beam, 13-first sliding beam, 14-second sliding beam, 15-guide rail frame, 16-guide rail. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods and examples. The purpose of providing the examples is only to illustrate, and not to impose any limitation.

[0028] It should be noted that the drawings are in a very simplified form and are not in precise proportions, and are only used to assist in explaining the technical solution of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the drawings can be referred to together. In addition, the terms "first" and "second" are only used to distinguish components. It should be understood that these components should not be limited by such terms. They themselves do not mean that these elements have the aforementioned ordinal numbers, nor do they represent the order of arrangement of a certain component and another component, or the order of the manufacturing method.

[0029] The embodiment of the present invention provides a mooring tensioning device applied to an offshore engineering mooring system. Figure 1 This is a schematic diagram of the mooring tensioning device. Figure 2 This is the application diagram of the mooring tensioning device. Figure 3 This is a schematic diagram of the frame structure of the mooring tensioning device. Figure 1 The mooring tensioning device of the embodiment of the present invention comprises a frame structure 1, a heavy-duty electric cylinder 2, a damper 3, a pulley block 4, an anchor chain 5, a chain guide 6, a tension sensor 7 and a fixed pile 9. Figure 2 and Figure 3The frame structure 1 includes a first fixed beam 11, a second fixed beam 12, a first sliding beam 13, a second sliding beam 14, a guide rail frame 15 and a guide rail 16. The guide rail 16 is fixed on the guide rail frame 15, and the guide rail frame 15 is connected between the first fixed beam 11 and the second fixed beam 12; the first fixed beam 11, the second fixed beam 12 and the guide rail frame 15 are fixed on the floating structure 100; the first sliding beam 13 and the second sliding beam 14 are slidably connected to the guide rail 16, and can slide along the guide rail within a certain distance range; the first sliding beam 13 is close to the first fixed beam 11, and the second sliding beam 14 is close to the second fixed beam 12. The heavy-duty electric cylinder 2 is connected between the first fixed beam 11 and the first sliding beam 13; the damper 3 is located between the first sliding beam 13 and the second sliding beam 14; the fixed pulley of the pulley block 4 is arranged on the second fixed beam 12, and the movable pulley is arranged on the second sliding beam 14; the fixed pile 9 is fixed on the floating structure 100; one end of the anchor chain 5 is fixed on the fixed pile 9, and after alternately passing around the fixed pulley and the movable pulley, it passes through the chain guide 6, and the other end is connected to the mooring cable 8 through the tension sensor 7. The specific connection method is shown in Figure 4 The tension sensor 7 is preferably a plate ring type tension sensor.

[0030] like Figure 1 and Figure 3 As shown, in some preferred embodiments, the guide rail frame 15 includes two parallel frame beams, the two ends of which are respectively connected to the first fixed beam 11 and the second fixed beam 12; a guide rail is fixed on each frame beam. The first sliding beam 13 and the second sliding beam 14 are both slidably connected to one of the guide rails at one end and slidably connected to the other guide rail at the other end. The first sliding beam 13 and the second sliding beam 14 are also arranged in parallel.

[0031] In some preferred embodiments, the mooring tensioning device comprises multiple sets of heavy-duty electric cylinders 2, such as Figure 1 The heavy-duty electric cylinder 2 includes three groups, but this is just an example. The fixed end of the heavy-duty electric cylinder 2 is connected to the first fixed beam 11, and the telescopic end is connected to the first sliding beam 13. Multiple groups of electric cylinders are evenly spaced between the first fixed beam 11 and the first sliding beam 13.

[0032] In some preferred embodiments, the number of the dampers 3 is multiple, for example Figure 1 The structure shown includes three dampers, and more preferably, the number is not less than 3. The damper 3 is arranged between the first sliding beam 13 and the second sliding beam 14, and can absorb the impact energy released by the rebound of the mooring cable 8 while increasing the feedback time of the heavy-duty electric cylinder. When the floating structure 100 has the maximum displacement, the stroke of the damper 3 has not yet reached the maximum value. The combination of the damper and the pulley block can effectively absorb the impact energy released by the rebound of the mooring cable, reduce the material performance loss of the mooring cable, and is suitable for the mooring positioning of the floating structure of the marine engineering.

[0033] Continue to refer Figure 1 In the pulley block 4, the number of fixed pulleys is n, which are evenly fixed on the second fixed beam 12; the number of movable pulleys is n-1, which are evenly fixed on the second sliding beam 14; the position of each movable pulley corresponds to the middle position of two adjacent fixed pulleys; preferably, n≥4. Preferably, the position of one end of the damper 3 connected to the first sliding beam corresponds to the position of the telescopic end of the heavy-duty electric cylinder, and the position of the other end connected to the second sliding beam corresponds to the position of the movable pulley.

[0034] In addition, the mooring tensioning device of the embodiment of the present invention also includes a communication module, such as a 4G or higher version communication module, which is used to realize remote control while remotely monitoring the offshore site, and can be controlled in real time at the remote mobile terminal when a problem occurs in the program operation. Based on this, another embodiment of the present invention also proposes a control method for the aforementioned mooring tensioning device, which is used to control the tension of the mooring tensioning device to be constant; the control method includes: collecting the tension signal of the mooring cable in real time through a tension sensor, and processing the tension signal through programmable logic control, and converting the tension signal into an electric cylinder extension control instruction; then, the extension and contraction of the heavy-duty electric cylinder is controlled according to the electric cylinder extension control instruction. When the telescopic end of the heavy-duty electric cylinder is extended, the mooring cable is released, reducing the mooring tension; when the telescopic end of the heavy-duty electric cylinder is contracted, the mooring cable is shortened, increasing the mooring tension; thereby realizing the constant tension application of the mooring cable. The mooring tensioning device monitors the tension of the mooring cable in real time through a tension sensor, and converts the tension signal into an electric cylinder extension control instruction by means of programmable logic control and other methods.

[0035] The floating structure 100 will be displaced to varying degrees under the combined effects of wind, waves and currents, and the tension of the mooring cable 8 will also change all the time. When the movement amplitude of the floating structure is small, the tension of the mooring cable 8 changes slightly, and the mooring cable 8 transmits the mooring cable tension to the anchor chain 5 through the plate ring tension sensor 7. The tension of the anchor chain 5 is transmitted to the second sliding beam 14 through the pulley block 4 to complete the first step of energy consumption, and then transmitted to the damper 3 to complete the second step of energy consumption, thereby realizing passive regulation of the mooring cable tension.

[0036] When the movement amplitude of the floating structure 100 further increases, the mooring tension changes significantly, and the passive regulation cannot meet the threshold requirement of the mooring cable tension, the tension signal of the mooring cable 8 collected by the plate ring tension sensor 7 is processed through programmable logic control, and then the tension signal is converted into the extension and contraction control instruction of the heavy-duty electric cylinder 2, and the extension and contraction of the heavy-duty electric cylinder 2 are automatically and intelligently controlled. When the heavy-duty electric cylinder 2 is extended, the mooring cable 8 is released, relieving the mooring tension; when the heavy-duty electric cylinder 2 is contracted, the mooring cable 8 is shortened, increasing the mooring tension; active regulation of the mooring cable tension is achieved, thereby achieving constant tension application of the mooring.

[0037] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A mooring tensioning device used in an offshore engineering mooring system, characterized in that: It comprises a frame structure (1), an electric cylinder (2), a damper (3), a pulley block (4), an anchor chain (5), a tension sensor (7) and a fixed pile (9); The frame structure (1) comprises a first fixed beam (11), a second fixed beam (12), a first sliding beam (13), a second sliding beam (14) and a guide rail assembly, wherein the guide rail assembly is connected between the first fixed beam (11) and the second fixed beam (12); the first fixed beam, the second fixed beam and the guide rail assembly are fixed on a floating structure; the first sliding beam (13) and the second sliding beam (14) are slidably connected to the guide rail assembly; the first sliding beam (13) is close to the first fixed beam (11), and the second sliding beam (14) is close to the second fixed beam (12); The electric cylinder (2) is connected between the first fixed beam (11) and the first sliding beam (13); the damper (3) is located between the first sliding beam (13) and the second sliding beam (14); the fixed pulley of the pulley block (4) is arranged on the second fixed beam (12), and the movable pulley is arranged on the second sliding beam (14); the fixed pile (9) is fixed on the floating structure; one end of the anchor chain (5) is fixed on the fixed pile (9), and after alternately passing around the fixed pulley and the movable pulley, the other end is connected to the mooring cable through the tension sensor.

2. The mooring tensioning device according to claim 1, characterized in that: The guide rail assembly comprises a guide rail frame (15) and a guide rail (16); the guide rail frame (15) is connected between the first fixed beam (11) and the second fixed beam (12); and the guide rail (16) is fixed on the guide rail frame (15).

3. The mooring tensioning device according to claim 2, characterized in that: The guide rail frame (15) comprises two parallel frame beams, and a guide rail is fixed on each frame beam.

4. The mooring tensioning device according to claim 1, characterized in that: The fixed end of the electric cylinder (2) is connected to the first fixed beam (11), and the telescopic end is connected to the first sliding beam (13).

5. The mooring tensioning device according to claim 1 or 4, characterized in that: There are multiple groups of electric cylinders (2), all of which are arranged between the first fixed beam and the first sliding beam. The fixed end of each group of electric cylinders is connected to the first fixed beam, and the telescopic end is connected to the first sliding beam.

6. The mooring tensioning device according to claim 1, characterized in that: It also includes a chain guide (6); after the anchor chain (5) alternately passes around the fixed pulley and the movable pulley, it passes through the chain guide (6) and is then connected to the mooring cable (8) through the tension sensor (7).

7. The mooring tensioning device according to claim 1, characterized in that: The number of the dampers (3) is plural; when the floating structure has a maximum displacement, the stroke of the damper has not yet reached a maximum value.

8. The mooring tensioning device according to claim 1, characterized in that: The number of the fixed pulleys is n, which are evenly fixed on the second fixed beam; the number of the movable pulleys is n-1, which are evenly fixed on the second sliding beam; the position of each movable pulley corresponds to the middle position of two adjacent fixed pulleys; n≥4.

9. The mooring tensioning device according to claim 1, characterized in that: It also includes a communication module for remote control while remotely monitoring the offshore site.

10. The control method of the mooring tensioning device according to any one of claims 1 to 9, characterized in that: Used to control the tension of the mooring tensioning device to be constant; the control method comprises: collecting the tension signal of the mooring cable in real time through the tension sensor, processing the tension signal through programmable logic control, converting the tension signal into an electric cylinder extension and contraction control instruction, and controlling the extension and contraction of the electric cylinder according to the electric cylinder extension and contraction control instruction; When the telescopic end of the electric cylinder is extended, the mooring cable is released, reducing the mooring tension; when the telescopic end of the electric cylinder is contracted, the mooring cable is shortened, increasing the mooring tension; Thereby, constant tension application of the mooring line is achieved.

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