Working method of a mechanical launchable offshore degaussing device

Abstract

The application relates to a working method of a mechanical retractable offshore degaussing device, in particular to the degaussing technical field. The method adopts a motor-driven degaussing cable retracting ship and heavy-load degaussing cable bundling; the motor-driven degaussing cable retracting ship is integrated with a cable bundle retracting reel, a cable bundle conveying crawler belt and a cable bundle retracting operation control platform and the like, is used for daily storage of the heavy-load degaussing cable bundling and deployment and recovery during the degaussing operation, the heavy-load degaussing cable bundling is externally coated with buoyancy material and can float on the water surface to perform the degaussing operation around a degaussing target. In a non-operation state, the cable bundling is reeled on the cable bundle retracting reel of the motor-driven degaussing cable retracting ship; after the degaussing operation starts, the motor-driven degaussing cable retracting ship can uniformly release the cable in the water, and the safe deployment of the long-distance heavy-load cable bundling is completed. After the degaussing cable bundling forms a closed coil around the ship, the degaussing field can be generated in the coil, and the degaussing operation is completed.

Description

Technical Field

[0001] This invention relates to the field of demagnetization technology, and in particular to a method for operating a mechanically deployable marine demagnetization device. Background Technology

[0002] Degaussing operations for ships and maritime targets are mainly divided into fixed degaussing stations and mobile degaussing vessels. While fixed degaussing devices are effective, they are highly dependent on location, have high infrastructure costs, and are immobile, making them unsuitable for degaussing needs in distant waters. Mobile degaussing vessels are primarily used for degaussing small and medium-sized ships, offering flexibility and mobility, but their long operation cycles make them unsuitable for emergency degaussing or degaussing large ships. Furthermore, both fixed degaussing devices and mobile degaussing vessels employ a "wrapping" technique, where the degaussing cable is manually or mechanically wrapped tightly against the ship's hull in a three-dimensional longitudinal motion. This method is not only labor-intensive and time-consuming, but the direct contact between the cable and the hull inevitably causes bidirectional physical wear, damaging the ship's protective capabilities and shortening the cable's lifespan. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a method for operating a mechanically deployable marine degaussing device. It employs a non-contact, surrounding layout instead of the traditional contact-wrapping layout, utilizing an integrated device to construct a horizontally closed degaussing loop around the target vessel. This method not only saves manpower, simplifies the deployment process, and shortens operation time, but also eliminates wear between the cable and the degaussing target, ensuring the target's integrity while extending the equipment's service life. It is suitable for marine degaussing devices.

[0004] The technical solution adopted in this invention is as follows: a working method for a mechanically deployed marine demagnetizing device, which employs a motorized demagnetizing cable deployment vessel and a heavy-duty demagnetizing cable bundle; the motorized demagnetizing cable deployment vessel integrates a cable bundle deployment drum, a cable bundle conveyor track, a cable bundle deployment operation control platform, a control room, and a power cabinet; during operation, the cable bundle is deployed to the demagnetizing target and energized for demagnetization; the heavy-duty demagnetizing cable bundle is externally covered with buoyancy material and laid in the sea during operation to form a closed loop to perform the demagnetization operation;

[0005] For large-scale target operations, the following steps are included:

[0006] S1: Preparation: For large targets, before the operation begins, the motorized demagnetizing cable retrieval vessel is moored at the dock and ready to go. The cable bundle is wound on the drum, and the first end of the cable bundle is released by the drum and the cable bundle conveyor belt. Finally, the end is connected to the power cabinet on shore.

[0007] S2: Cable Bundle Laying: After the operation begins, the motorized demagnetized cable laying vessel leaves the dock and moves to the designated position. The control system synchronously adjusts the output speed of the drum and the conveyor belt to lay the cable bundle smoothly on the water surface, and the cable floats on the water surface.

[0008] S3: Target berthing: When the motorized demagnetizing cable retrieval vessel arrives at the designated position, the cable bundle is laid out; after the target berths, the motorized demagnetizing cable retrieval vessel sails along the trajectory around the target vessel, so that it forms a horizontal circling trajectory without contacting the target hull, and finally the cable bundle surrounds the demagnetizing target.

[0009] S4: Cable bundle forms a closed loop: When the motorized demagnetizing cable retrieval vessel returns to the dock, it is first moored at the dock. Then, the tail end of the cable bundle is separated from the motorized demagnetizing cable retrieval vessel via the cable bundle conveyor belt and connected to the shore power supply. At this time, the cable bundle forms a closed loop.

[0010] S5: Power-on demagnetization: The motorized demagnetization cable is retracted and deployed as the ship leaves the dock, and finally power is applied for demagnetization.

[0011] For small-scale target tasks, the following steps are included:

[0012] a. Before the operation begins, the degaussing target is anchored on the sea surface, and the motorized degaussing cable retrieval vessel travels to the head of the target; the motorized degaussing cable retrieval vessel floats on the sea surface, the heavy-duty cable bundle is wound on the reel, and the head of the cable bundle is released by the reel and the cable bundle conveyor belt, fixing the head of the cable bundle to the head of the degaussing target.

[0013] b. After the operation begins, the motorized demagnetizing cable reeling vessel sails along the trajectory around the target vessel, while the control system synchronously adjusts the output speed of the drum and the conveyor belt to smoothly lay the cable bundle on the water surface.

[0014] c. The motorized demagnetizing cable reeling vessel bypasses the target vessel and returns to the bow, and the head end of the cable bundle is connected to the power cabinet on the motorized demagnetizing cable reeling vessel. At this time, the heavy-duty demagnetizing cable bundle surrounds the target.

[0015] d. After the motorized demagnetizing cable reeling vessel recovers the head end of the cable bundle, the tail end of the cable bundle is detached from the drum via the cable bundle conveyor belt and connected to the power cabinet on the ship. At this time, the cable bundle forms a closed loop.

[0016] e. The motorized demagnetizing cable reeling vessel supplies power to the target vessel and then demagnetizes it.

[0017] Furthermore, the motorized demagnetizing cable reeling vessel is routinely moored at the dock to store cable bundles.

[0018] Furthermore, the motorized demagnetizing cable reel is equipped with a cable reel. The reel is used as a reel when arranged vertically and as a reel when arranged horizontally, so as to realize the cable reel operation.

[0019] Furthermore, the cable bundle winding drum on the motorized demagnetizing cable winding vessel is used daily to store cable bundles. When laying cable bundles, the power is turned on and the drum unwinds to lay the cable bundles; when retrieving cable bundles, the drum winds up to retrieve the cable bundles.

[0020] Furthermore, the motorized demagnetizing cable reeling vessel is equipped with a control room, which integrates a control cabinet that adjusts the cable reeling speed in real time.

[0021] Furthermore, the operation control platform on the motorized demagnetizing cable reeling vessel selects the cable bundle winding and unwinding modes to enable on-site setting and status monitoring of cable winding and unwinding speed parameters.

[0022] Furthermore, the heavy-duty cable bundle is covered with buoyancy material to float on the water surface, naturally unfolds on the water surface, and is connected end to end with the power supply junction box to form a single-turn closed coil. After current is passed through, the demagnetization operation is completed.

[0023] This invention provides a method for operating a mechanically operated marine demagnetizing device, comprising a motorized demagnetizing cable retrieval vessel and a heavy-duty demagnetizing cable bundle; the motorized demagnetizing cable retrieval vessel is a large motorized marine vessel that can be used for cable bundle storage and retrieval, integrating a cable bundle retrieval drum, a cable bundle conveyor track, a cable bundle retrieval operation control platform, a control room, and a power cabinet; the cable bundle is made of multiple cables injected with adhesive and externally covered with buoyancy material.

[0024] The motorized demagnetizing cable reeling vessel is normally moored at the dock and can store cable bundles. After the demagnetizing operation is started, the motorized demagnetizing cable reeling vessel can complete the cable laying, form a closed coil, and carry out the demagnetizing operation; after the demagnetizing operation is completed, the cable bundle is then retrieved and wound up.

[0025] The cable bundle winding drum is a vertical drum located near the bow of the motorized demagnetizing cable winding vessel. In non-operating conditions, the cable bundle winding drum on the motorized demagnetizing cable winding vessel is used to store cables, and the cable bundle can be wound onto the drum. In operating conditions, the rotation of the drum provides the main power for winding and unwinding the cable bundle.

[0026] The cable bundle conveyor track is installed near the stern of the motorized demagnetized cable winding and unwinding vessel. The cable bundle conveyor track guides the winding and unwinding of the cable bundle, assisting the cable bundle to be smoothly wound and unwound along a predetermined trajectory, avoiding wear and excessive bending.

[0027] The control room is equipped with a control cabinet, which can adjust the reel speed in real time according to the cable length to achieve constant speed cable laying, thereby counteracting the large inertia of the heavy cable bundle and laying the cable bundle smoothly on the water surface.

[0028] The cable harness winding and unwinding operation control platform is installed next to the cable harness winding and unwinding drum. It can select the operation mode of winding or unwinding the cable harness and realize the on-site setting and status monitoring of the cable winding and unwinding speed parameters.

[0029] The heavy-duty demagnetizing cable bundle includes a rectangular long cable bundle with two-dimensional different stiffness or a multi-core circular long cable bundle made of multiple cables injected with glue; both types of cable bundles are covered with closed-cell foamed buoyancy material, which can float on the water surface, naturally spread on the water surface and be connected end to end through the junction box to form a single-turn large closed coil, and complete the ship demagnetization after current is passed through it.

[0030] The core steps of the described method include using a motorized demagnetizing cable reel-and-deel vessel to navigate around the target vessel. Through the dynamic coordinated drive of the cable reel-and-deel drum and the cable conveyor belt, the heavy-duty demagnetizing cable bundle is laid out on the water surface in a non-contact manner, forming a horizontal closed demagnetizing coil surrounding the demagnetizing target. During the deployment process, the control system adjusts the drum torque and the conveyor belt speed in real time according to the speed of the reel-and-deel vessel and the length of the cable bundle in the water, in order to counteract the large inertia and fluid resistance of the heavy-duty cable bundle, ensuring that the cable bundle unfolds smoothly and maintains the preset circumferential trajectory.

[0031] The aforementioned large targets are typically ships or vessels with a displacement of 20,000 tons or more or a length of 200 meters or more; the rest are small targets.

[0032] Compared with existing offshore demagnetizing cable laying devices, the advantages of this invention are:

[0033] (1) An innovative horizontal surrounding demagnetization topology structure is adopted, which utilizes the buoyancy of the cable bundle to maintain a safe distance from the target ship. This completely eliminates the physical contact and friction between the heavy cable bundle and the stealth coating and anti-corrosion layer on the ship's surface, achieving non-destructive and safe demagnetization operation while ensuring the integrity of the target's protection.

[0034] (2) For heavy-duty long-distance cable bundles with large mass and large inertia, the present invention overcomes the fluid resistance and motion inertia of the cable bundle after entering the water by the coordinated cooperation of the drum and the conveyor belt, ensuring that the rectangular cross-section cable bundle does not twist or pile up during the winding and unwinding process.

[0035] (3) This invention enables the recycling and easy storage of heavy-duty long cable bundles. It realizes the orderly winding and storage of ultra-long heavy-duty cable bundles, solves the storage problem of large-scale cable bundles in limited deck space, and facilitates subsequent maintenance and management.

[0036] (4) By using a mechanical drum, heavy-duty demagnetized cable bundles can be wound up and unwound, which improves the efficiency and stability of cable winding and unwinding, gets rid of the tedious process of traditional manual threading and binding, and realizes the mechanized and automated deployment of heavy-duty cable bundles. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a mechanically deployable marine degaussing device.

[0038] Figure 2 This is a longitudinal cross-sectional view of a mechanically deployable marine degaussing device.

[0039] Figure 3 A diagram illustrating the preparatory work before the cable laying process begins.

[0040] Figure 4 A schematic diagram showing the deployment and retrieval of a motorized demagnetizing cable to a designated location.

[0041] Figure 5 A diagram showing the target vessel berthing.

[0042] Figure 6 This is a schematic diagram of a mobile demagnetizing cable retrieval vessel returning to the dock.

[0043] Figure 7 This is a schematic diagram of a closed cable connection coil.

[0044] Figure 8 A schematic diagram of demagnetization for shore power supply.

[0045] Figure 9 This is a schematic diagram of the overall process for cable bundle laying.

[0046] Among them, 1. Cable bollard, 2. Cable bundle winding and unwinding drum support, 3. Cable bundle winding and unwinding drum, 4. Motorized demagnetizing cable winding and unwinding boat, 5. Control cabinet, 6. Control room, 7. Power supply cabinet, 8. Cable bundle winding and unwinding operation control platform, 9. Cable bundle conveyor belt, 10. Heavy-duty demagnetizing cable bundle. Detailed Implementation

[0047] The present invention will be specifically described below through embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention, but are not limited thereto, unless otherwise stated.

[0048] The specific embodiments of the present invention are described in detail below with reference to the technical solutions:

[0049] Figure 1 and Figure 2 The diagram shows a motorized demagnetizing cable reel-and-deployer vessel 4, equipped with an integrated control cabinet 5, power supply cabinet 7, and control room 6, as well as a cable bundle reel-and-deployment operation control platform 8. The front of the vessel 4 is supported by a cable bundle reel-and-deployment drum 3 via a cable bundle reel-and-deployment drum bracket 2, while the rear is equipped with a cable bundle conveyor track 9. Heavy-duty demagnetizing cable bundles 10 are wound on the cable bundle reel-and-deployment drum 3, and these bundles are deployed and retrieved via the cable bundle conveyor track 9. Multiple bollards 1 are installed on the motorized demagnetizing cable reel-and-deployer vessel 4.

[0050] Example 1

[0051] This invention provides a method for operating a mechanically operated marine demagnetizing device, comprising a motorized demagnetizing cable retrieval vessel and a heavy-duty demagnetizing cable bundle. The motorized demagnetizing cable retrieval vessel is 70m long, 40m wide, and 5m deep, with fenders around its perimeter. The vessel itself is maneuverable. The platform integrates a cable bundle retrieval drum, a cable bundle conveyor track, a cable bundle retrieval operation control platform, a power cabinet, and a control room. The control room contains a power cabinet and a control cabinet with an IP20 protection rating. The demagnetizing cable bundle is made of 70 sections of 1000m long cable bundles, segmented and glued together, and externally covered with buoyancy material. All the devices of this invention are integrated on the motorized demagnetizing cable retrieval vessel, which is routinely moored at the dock.

[0052] like Figure 3 As shown, before the demagnetization operation begins, the motorized demagnetization cable reeling vessel is moored at the dock, the cable bundle is wound on the drum, and the cable bundle head is connected to the shore power cabinet via the cable bundle transmission track.

[0053] like Figure 4 As shown, once the degaussing operation begins, the motorized degaussing cable retrieval vessel releases the cable and sails along a trajectory around the target vessel. Simultaneously, the cable retrieval operation control platform controls the drum and cable retrieval conveyor track to rotate and release the cable via the control cabinet.

[0054] The control cabinet automatically adjusts the motor speed based on the cable length to achieve constant-speed cable laying, until the motorized demagnetizing cable retrieval vessel reaches the designated position.

[0055] like Figure 5 As shown, after the target vessel berths with the assistance of tugboats, the motorized demagnetizing cable reeling vessel circles around the target vessel and returns to the dock. At this time, the cable bundle floats on the water and surrounds the target vessel.

[0056] like Figure 6 As shown, after the motorized demagnetizing cable retrieval vessel returns to the dock, it will be moored at the dock.

[0057] like Figure 7 As shown, the cable bundle tail end is completely detached from the motorized demagnetizing cable reeling vessel via the cable bundle conveyor belt and connected to the shore power cabinet. At this time, both ends of the cable bundle are connected to the shore power cabinet, forming a closed loop.

[0058] like Figure 8 As shown, the motorized demagnetizing cable reeling vessel departs from the dock, and shore power is supplied for demagnetization.

[0059] Example 2

[0060] For degaussing small to medium-sized targets, this invention provides a method for operating a mechanically operated marine degaussing device. The device includes a motorized degaussing cable retrieval vessel and a degaussing cable bundle. The motorized degaussing cable retrieval vessel is 60m long, 30m wide, and 4m deep, with fenders around its perimeter. The vessel itself is maneuverable. The platform integrates a cable bundle retrieval reel, a cable bundle conveyor belt, a cable bundle retrieval operation control platform, a power cabinet, and a control room. The control room contains a power cabinet and a control cabinet with an IP20 protection rating. The degaussing cable bundle consists of 30 sections of 400m long cables, segmented and glued together, and externally covered with buoyancy material. All the devices of this invention are integrated on the motorized degaussing cable retrieval vessel, which is routinely moored at the dock.

[0061] Before the operation begins, the degaussing target is anchored on the sea surface, and the motorized degaussing cable retrieval vessel travels to the bow of the target. The motorized degaussing cable retrieval vessel floats on the sea surface, with the cable bundle wound on a reel. The first end of the cable bundle is released by the reel and the cable bundle conveyor belt, securing the first section of the cable bundle to the bow of the target vessel.

[0062] After the operation begins, the motorized demagnetizing cable retrieval vessel navigates along the trajectory around the target vessel. At the same time, the cable retrieval operation control platform controls the reel and cable retrieval conveyor track to coordinate the cable release. The control cabinet automatically adjusts the reel speed according to the cable release length to achieve constant speed cable release.

[0063] The motorized demagnetizing cable reeling vessel bypasses the target vessel and returns to the bow, retrieving the cable bundle and connecting the head end to the ship's power cabinet. At this point, the heavy-duty demagnetizing cable bundle surrounds the target.

[0064] When the motorized demagnetizing cable reel returns to the stern, the tail end of the cable bundle is detached from the drum via the cable bundle conveyor belt and connected to the ship's power cabinet, at which point the cable bundle forms a closed loop.

[0065] The motorized demagnetizing cable reeling vessel supplies power to the target vessel and then demagnetizes it.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for operating a mechanically deployed and retrieved marine demagnetizing device, characterized in that, This method employs a motorized demagnetizing cable retrieval vessel and a heavy-duty demagnetizing cable bundle. The motorized demagnetizing cable retrieval vessel integrates a cable bundle retrieval drum, a cable bundle conveyor belt, a cable bundle retrieval operation control platform, a control room, and a power cabinet. During operation, it completes the cable bundle deployment and energization demagnetization of the target. The heavy-duty demagnetizing cable bundle is externally covered with buoyancy material and is laid in the sea to form a closed loop to perform the demagnetization operation. For large-scale target operations, the following steps are included: S1: Preparation: For large targets, before the operation begins, the motorized demagnetizing cable retrieval vessel is moored at the dock and ready to go. The cable bundle is wound on the drum, and the first end of the cable bundle is released by the drum and the cable bundle conveyor belt. Finally, the end is connected to the power cabinet on shore. S2: Cable Bundle Laying: After the operation begins, the motorized demagnetized cable laying vessel leaves the dock and moves to the designated position. The control system synchronously adjusts the output speed of the drum and the conveyor belt to lay the cable bundle smoothly on the water surface, and the cable floats on the water surface. S3: Target berthing: When the motorized demagnetizing cable retrieval vessel arrives at the designated position, the cable bundle is laid out; after the target berths, the motorized demagnetizing cable retrieval vessel sails along the trajectory around the target vessel, so that it forms a horizontal circling trajectory without contacting the target hull, and finally the cable bundle surrounds the demagnetizing target. S4: Cable bundle forms a closed loop: When the motorized demagnetizing cable retrieval vessel returns to the dock, it is first moored at the dock. Then, the tail end of the cable bundle is separated from the motorized demagnetizing cable retrieval vessel via the cable bundle conveyor belt and connected to the shore power supply. At this time, the cable bundle forms a closed loop. S5: Power-on demagnetization: The motorized demagnetization cable is retracted and deployed as the ship leaves the dock, and finally power is applied for demagnetization. For small-scale target tasks, the following steps are included: a. Before the operation begins, the degaussing target is anchored on the sea surface, and the motorized degaussing cable retrieval vessel travels to the head of the target; the motorized degaussing cable retrieval vessel floats on the sea surface, the heavy-duty cable bundle is wound on the reel, and the head of the cable bundle is released by the reel and the cable bundle conveyor belt, fixing the head of the cable bundle to the head of the degaussing target. b. After the operation begins, the motorized demagnetizing cable reeling vessel sails along the trajectory around the target vessel, while the control system synchronously adjusts the output speed of the drum and the conveyor belt to smoothly lay the cable bundle on the water surface. c. The motorized demagnetizing cable reeling vessel bypasses the target vessel and returns to the bow, and the head end of the cable bundle is connected to the power cabinet on the motorized demagnetizing cable reeling vessel. At this time, the heavy-duty demagnetizing cable bundle surrounds the target. d. After the motorized demagnetizing cable reeling vessel recovers the head end of the cable bundle, the tail end of the cable bundle is detached from the drum via the cable bundle conveyor belt and connected to the power cabinet on the ship. At this time, the cable bundle forms a closed loop. e. The motorized demagnetizing cable reeling vessel supplies power in front of the target vessel and then demagnetizes the cable at the end. The heavy-duty demagnetizing cable bundle includes a rectangular long cable bundle or a multi-core circular long cable bundle with two-dimensional different stiffness, made by injecting glue into multiple cables. Large targets are ships or vessels with a displacement of 20,000 tons or more or a length of 200 meters or more; the rest are small targets.

2. The operating method of the mechanically deployed marine demagnetizing device according to claim 1, characterized in that, The motorized demagnetizing cable retrieval vessel is routinely moored at the dock to store cable bundles.

3. The operating method of the mechanically deployed marine demagnetizing device according to claim 2, characterized in that, The motorized demagnetizing cable retrieval vessel is equipped with a cable retrieval drum. When arranged vertically, the drum is used as a reel, and when arranged horizontally, it is used as a spool to realize the cable retrieval and retrieval operations.

4. The operating method of the mechanically deployed marine demagnetizing device according to claim 3, characterized in that, The cable bundle winding drum on the motorized demagnetizing cable winding vessel is used daily to store cable bundles. When laying cable bundles, the power is turned on and the drum unwinds to lay the cable bundles; when retrieving cable bundles, the drum winds up to retrieve the cable bundles.

5. The operating method of the mechanically deployed marine demagnetizing device according to claim 4, characterized in that, The motorized demagnetizing cable reeling vessel is equipped with a control room, which integrates a control cabinet that adjusts the cable reeling speed in real time.

6. The operating method of the mechanically deployed marine demagnetizing device according to claim 5, characterized in that, The cable bundle deployment and retraction operation control platform on the motorized demagnetizing cable deployment and retraction vessel selects the cable bundle winding and unwinding modes, and realizes on-site setting and status monitoring of cable deployment and retraction speed parameters.

7. The operating method of the mechanically deployed marine demagnetizing device according to claim 6, characterized in that, The heavy-duty cable bundle is covered with buoyancy material to float on the water surface, naturally unfolds on the water surface, and is connected end to end with the power supply junction box to form a single-turn closed coil. After current is passed through, the demagnetization operation is completed.

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