Adjustable load deep sea umbilical stress relief device

Abstract

The application discloses a deep-sea umbilical cable stress release device with adjustable load, adopts a core structure of a boom assembly, a fixed frame, a bidirectional hinging mechanism and a drawer type counterweight block, adjusts the total load to 30%-40% of the safe working load SWL of the umbilical cable through increasing or decreasing the number of the counterweight block, adapts to various umbilical cables with SWL greater than or equal to 12.5 kN, and the lifting lug has the functions of lifting and preventing swinging; the fixed frame is a single-side open type anti-collision structure, can carry a deep-sea pressure-resistant monitoring cabin and an environment sensing unit, the square tube end of the fixed frame is provided with a decompression through hole, and can resist deep-sea high pressure; the bidirectional hinging mechanism realizes double-degree-of-freedom adaptive swinging, offsets ship swinging and sea current impact, and maintains the vertical posture of the deep-sea umbilical cable stress release device; the application has the advantages of compact structure, convenient assembly, can significantly improve the adaptability, reliability and safety of the deep-sea umbilical cable stress release, and integrates multiple counterweight block functions, thereby reducing operation complexity.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering equipment technology, specifically relating to an adjustable load deep-sea umbilical cable stress relief device. Background Technology

[0002] Deep-sea umbilical cable stress relief devices are primarily used to eliminate mechanical stress generated during the manufacturing, transportation, and storage of umbilical cables, ensuring the safety of deployment of heavy-duty deep-sea equipment and the long-term stability of power transmission and signal control. Currently, the mainstream stress relief methods in the industry include: Vertical static placement: The umbilical cable is suspended vertically to release stress naturally, suitable for short-distance cables. Horizontal rolling deployment: The cable is rolled using rollers, relying on friction to relieve stress, but is susceptible to roller jamming. Manual large-circle static placement: The cable is manually coiled into a large-diameter ring and placed statically, limited by working space. Some patents use multi-segment roller-type elastic buffer mechanisms to achieve continuous stress relief, but the structure is complex, reliability is low, and it is prone to failure due to roller jamming under alternating ship loads; furthermore, open bearings are difficult to resist salt spray corrosion. Other patents use relative rotation between the winding drum and connecting drum to prevent cable tangling, but this is only suitable for small-section cables.

[0003] Existing technologies have significant drawbacks: 1. Poor adaptability: Designed for short-distance, small-section, and low-linear-density cables, they cannot meet the stress release requirements of "long-distance, large-section, and high-linear-density" umbilical cables in heavy-duty deep-sea scenarios. 2. Weak environmental adaptability: The open structure is susceptible to corrosion from high salt spray, leading to wear and failure; under six-degree-of-freedom alternating loads on a ship, the device's attitude is unstable, resulting in low stress release efficiency. 3. High operational difficulty: Manual coiling requires a large deck space, while ship decks are narrow and swaying, significantly increasing operational risks. 4. Limited functionality: Only stress release can be achieved; it cannot simultaneously complete the functional verification of deep-sea environmental monitoring and deployment / recovery systems.

[0004] Therefore, developing a deep-sea umbilical cable stress relief device that combines load adjustability, corrosion resistance reliability, attitude adaptability, and functional integration is of key significance for improving the operational safety of deep-sea equipment and extending the service life of umbilical cables. Summary of the Invention

[0005] This invention provides an adjustable load deep-sea umbilical cable stress relief device, which can solve the following problems existing in the prior art: (1) Adaptability problem: How to achieve stress relief adaptation for umbilical cables with different safe working loads (SWL) and different cross-sectional specifications through modular design. (2) Environmental tolerance problem: How to resist high salt spray corrosion and deep-sea high pressure through material selection and structural design to ensure the long-term reliability of the device. (3) Attitude stability problem: How to counteract the coupling effect of ship swaying and ocean current impact, maintain the vertical operating attitude of the device, and avoid stress relief failure. (4) Functional integration problem: How to simultaneously install monitoring equipment and verify the deployment and recovery system during the stress relief process to improve operational efficiency and safety.

[0006] To achieve the above objectives, the specific technical solution is as follows:

[0007] An adjustable load deep-sea umbilical cable stress relief device is provided, wherein the deep-sea umbilical cable stress relief device is vertically installed on the A-type jack pulley block of the deployment vessel, and deep-sea deployment and retrieval are achieved by a marine winch; wherein, it includes a boom assembly (100), a fixed frame (200), a two-way hinge mechanism (300), and a drawer-type counterweight (400); the boom assembly (100) passes through the fixed frame (200) and is hinged to the drawer-type counterweight (400) through the two-way hinge mechanism (300).

[0008] In a preferred embodiment of the present invention, the boom assembly (100) includes a vertical rod (102), a top bidirectional hinge fixing point (101) and a bottom bidirectional hinge fixing point (103) located at both ends of the boom assembly (100); the top bidirectional hinge fixing point (101) is used to connect the deep-sea umbilical cable bearing head; the bottom bidirectional hinge fixing point (103) is connected to the drawer-type counterweight (400), forming a two-degree-of-freedom swing system to maintain the vertical operating posture of the deep-sea umbilical cable stress relief device.

[0009] In a preferred embodiment of the present invention, the fixed frame (200) adopts a single-sided open topology structure, and its sidewall is formed by orthogonally welding multiple alloy square tubes to form a grid-like protective fence. The middle of its top surface and the middle of its bottom surface are reserved for the movement space of the hanging rod assembly (100); the bottom of the fixed frame (200) is connected to the drawer-type counterweight (400) by welding.

[0010] In a preferred embodiment of the present invention, the drawer-type counterweight (400) includes a first-layer counterweight (401), multiple intermediate-layer counterweights (402), and a bottom-layer counterweight (403). The top of the first-layer counterweight (401) is flat, and a suspension point (406) is provided in the middle position. The suspension point (406) is connected to the bottom bidirectional hinge fixing point (103). The tops of the multiple intermediate-layer counterweights (402) and the bottom-layer counterweight (403) are all provided with protruding structures, and the bottoms of the first-layer counterweight (401) and the multiple intermediate-layer counterweights (402) are all provided with slot structures that match the protruding structures, thereby limiting the longitudinal displacement of the intermediate-layer counterweights (402). The bottom surface of the bottom-layer counterweight (403) is a flat floor base to ensure that the entire device is placed stably. All counterweights are provided with four symmetrical lifting lugs (404) and transverse positioning threaded holes (405).

[0011] In a preferred embodiment of the present invention, the bidirectional hinge mechanism (300) includes a positioning screw (301) and a locking nut (302). The bottom bidirectional hinge fixing point (103) of the rod assembly (100) is aligned with the shaft hole of the suspension point (406) of the first-layer counterweight block (401). After inserting the positioning screw (301), the locking nut (302) is tightened to form an adaptive swing pair within a preset pitch angle range.

[0012] In a preferred embodiment of the present invention, the mass of a single independent counterweight is 0.5 tons, and the protruding structure and the slot structure form an arc-shaped interlocking structure.

[0013] In a preferred embodiment of the present invention, the lifting lug (404) has a dual function: on the one hand, it serves as a force-bearing interface for the lifting, transportation and deck installation of the independent counterweight; on the other hand, it serves as an anti-sway anchor point when the device is deployed at sea; the anti-sway rope is used to suppress the collision risk caused by the ship's swaying. The anti-sway rope is a high-strength nylon rope with a diameter ≥20mm. One end is fixed to the lifting lug (404), and the other end is fixed to the ship's deck by a ground anchor bolt with a rated tensile force ≥100kN.

[0014] In a preferred embodiment of the present invention, the preset pitch angle range is -10° to 10°.

[0015] In a preferred embodiment of the present invention, the deep-sea pressure-resistant monitoring cabin and the marine environment sensing unit are further included; the deep-sea pressure-resistant monitoring cabin and the marine environment sensing unit are fixed to the inside of the anti-collision fence of the fixed frame (200) by anti-corrosion clamps.

[0016] In a preferred embodiment of the present invention, the ends of the square tubes on the side walls of the fixed frame (200) are provided with pressure-reducing through holes, which can prevent plastic deformation of the frame caused by the high pressure environment in the deep sea. At the same time, the space above the drawer-type counterweight (400) of the fixed frame (200) can effectively avoid collision with seabed rocks and provide a landing buffer space. The total load can be adjusted to 30% to 40% of the target umbilical cable safe working load SWL by increasing or decreasing the number of counterweights of the drawer-type counterweight (400), so as to meet the stress release requirements of the umbilical cable with SWL≥12.5kN.

[0017] Compared with the prior art, the embodiments of the present invention provide a deep-sea umbilical cable stress relief device with adjustable load, which has the following beneficial effects:

[0018] (1) The present invention adopts a structural form combining a rod assembly, a fixed frame, and a drawer-type counterweight, which has the advantages of compact structure and convenient assembly. The entire device is cast from anti-corrosion alloy material, which can effectively cope with high salt spray corrosion environment and ensure the long-term effectiveness of stress relief device.

[0019] (2) The total loading mass of the drawer-type counterweight is 30% to 40% of the safe working load of the target deep-sea umbilical cable, which can cover the stress release scenario of the umbilical cable with a safe working load ≥12.5kN; the counterweight is equipped with symmetrical lifting lugs at both ends, which also serve as the counterweight lifting interface function and the anti-sway anchoring point function to suppress the swing of the device during the deployment process.

[0020] (3) The fixed frame adopts a single-sided open structure, providing a stable mounting base for the deep-sea pressure-resistant monitoring cabin and the marine environment sensing unit. The monitoring cabin has built-in monitoring sensors to collect umbilical cable stress release data in real time. The side walls of the frame are anti-collision fences, which have the function of protecting key equipment components in complex marine environments and ensuring the safety of deep-sea umbilical cable stress release monitoring operations.

[0021] (4) The boom assembly is connected to the drawer-type counterweight through a two-way hinge mechanism, which provides the device with adaptive attitude adjustment capability under the conditions of ship roll ±15° and pitch ±10°, and suppresses the dynamic load impact caused by the coupling effect of ocean current and ship motion.

[0022] (5) The present invention achieves continuous load adjustment through modular counterweight, adapting to complex marine stress release scenarios of umbilical cables of different specifications; the open frame lays a good foundation for the integration of deep-sea monitoring systems and ensures operational safety under complex sea conditions; the multi-degree-of-freedom boom structure reduces the risk of deployment and recovery, and effectively improves the adaptability of the operating vessel. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an isometric view of a deep-sea umbilical cable stress relief device with adjustable load provided in an embodiment of the present invention.

[0025] Figure 2 This is a top view of an adjustable load deep-sea umbilical cable stress relief device provided in an embodiment of the present invention.

[0026] Figure 3 Another isometric view of a deep-sea umbilical cable stress relief device with adjustable load provided in an embodiment of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The terms "upper," "lower," "front," "rear," "left," and "right," etc., used when describing the installation position or direction of the structure or components in this embodiment are based on the orientation shown in the accompanying drawings. They are merely for convenience of description, used to distinguish the relative positions of various components or directions, and do not represent the orientation of the system or functional components in this embodiment during use.

[0028] This invention provides an adjustable load deep-sea umbilical cable stress relief device. The deep-sea umbilical cable stress relief device is vertically installed on the A-type gantry pulley block of the deployment vessel. It is used for deep-sea deployment and retrieval by a marine winch. It is used to eliminate mechanical stress before the deep-sea umbilical cable is put into use, and to ensure the safety of deployment of deep-sea heavy-duty operation equipment and the long-term stability of umbilical cable power transmission and signal control.

[0029] like Figure 1 , Figure 2 and Figure 3As shown, the deep-sea umbilical cable stress relief device includes a boom assembly 100, a fixed frame 200, a bidirectional hinge mechanism 300, and a drawer-type counterweight 400. The boom assembly 100 passes through the fixed frame 200 and is hinged to the drawer-type counterweight 400 via the bidirectional hinge mechanism 300. The detachable modular drawer-type counterweight of this embodiment is adaptable to application scenarios of umbilical cables of different specifications. The overall anti-corrosion material design of the deep-sea umbilical cable stress relief device is designed to cope with high salt spray corrosion operation scenarios, and the adaptive attitude adjustment structure mitigates the impact of ship movement and ocean currents.

[0030] like Figure 1 As shown, the boom assembly 100 includes a vertical rod 102, a top bidirectional hinged fixing point 101 located at both ends of the boom assembly 100, and a bottom bidirectional hinged fixing point 103. The top bidirectional hinged fixing point 101 is used to connect the deep-sea umbilical cable support head. The bottom bidirectional hinged fixing point 103 connects to a drawer-type counterweight 400, forming a two-degree-of-freedom swing system to maintain the vertical operating posture of the deep-sea umbilical cable stress relief device.

[0031] The fixed frame 200 adopts a single-sided open topology configuration. Its sidewalls are formed by orthogonally welding multiple alloy square tubes to form a grid-like protective fence. The middle of its top surface and the middle of its bottom surface are reserved for the movement of the hanging rod assembly 100. The bottom of the fixed frame 200 is connected to the drawer-type counterweight block 400 by welding.

[0032] like Figure 1 and Figure 3 As shown, the drawer-type counterweight 400 includes a first-layer counterweight 401, multiple intermediate-layer counterweights 402, and a bottom-layer counterweight 403. The top of the first-layer counterweight 401 is flat, with a suspension point 406 located in its middle position. The suspension point 406 is connected to the bottom bidirectional hinged fixing point 103. The tops of the multiple intermediate-layer counterweights 402 and the bottom-layer counterweight 403 are all provided with protruding structures, and the bottoms of the first-layer counterweight 401 and the multiple intermediate-layer counterweights 402 are all provided with slot structures that match the protruding structures, thereby limiting the longitudinal displacement of the intermediate-layer counterweights 402. The bottom surface of the bottom-layer counterweight 403 is a flat, ground-based base, ensuring the stable landing of the entire device. All counterweights are provided with four symmetrical lifting lugs 404 and transverse positioning threaded holes 405. The mass of a single independent counterweight is 0.5 tons, and the aforementioned protruding structures and slot structures form an arc-shaped interlocking structure.

[0033] Lifting lug 404 has a dual function: firstly, it serves as a load-bearing interface for the lifting, transportation, and deck installation of independent counterweights; secondly, it acts as an anti-sway anchor point during the deployment of the equipment at sea, suppressing the risk of collision caused by ship swaying by securing the anti-sway rope. The anti-sway rope is a high-strength nylon rope with a diameter ≥20mm. One end is secured to lifting lug 404, and the other end is fixed to the ship's deck by a ground anchor bolt with a rated tensile strength ≥100kN.

[0034] The fixed frame 200 has pressure-reducing through holes at the ends of the square tubes on its side walls to prevent plastic deformation of the frame caused by the high pressure environment in the deep sea. At the same time, the space above the drawer-type counterweight 400 can effectively avoid collisions with seabed rocks and provide a landing buffer space. The total load can be adjusted to 30% to 40% of the target umbilical cable's safe working load SWL by increasing or decreasing the number of counterweights in the drawer-type counterweight 400, thus meeting the stress release requirements of the umbilical cable with SWL≥12.5kN.

[0035] like Figure 2 As shown, the bidirectional hinge mechanism 300 includes a positioning screw 301 and a locking nut 302. The bottom bidirectional hinge fixing point 103 of the boom assembly 100 is aligned with the suspension point 406 shaft hole of the first-layer counterweight block 401. After inserting the positioning screw 301, the locking nut 302 is tightened, forming an adaptive swing pair within a preset pitch angle range. The preset pitch angle range is -10° to 10°. Combined with the top bidirectional hinge fixing point 101, a two-degree-of-freedom swing system is formed. Under conditions of ±15° roll and ±10° pitch, it maintains the vertical state of the drawer-type counterweight block 400, counteracting the coupling impact of ocean currents and the ship.

[0036] The deep-sea umbilical cable stress relief device also includes a deep-sea pressure-resistant monitoring chamber and a marine environmental sensing unit. These components are fixed to the inside of the anti-collision fence of the fixed frame 200mm using corrosion-resistant clamps. The device is designed with materials and environmental compatibility in mind. The entire device is cast from corrosion-resistant alloy materials (such as Hastelloy or duplex stainless steel), and the surface is passivated to resist corrosion from the high salt spray and high water pressure environment of the deep sea, extending its service life. The deployment and verification are designed in a coordinated manner. The device is slowly deployed to the deep sea using a marine winch, and stress relief of the umbilical cable is achieved using a vertical static placement method. During deployment, the deep-sea pressure-resistant monitoring chamber simultaneously records the number of umbilical cable spins and the device's attitude, while the environmental sensing unit collects water depth and current velocity data. This process simultaneously verifies the functionality of the deployment and recovery system, achieving an integrated system of "stress relief - data monitoring - system calibration."

[0037] To adapt to stress relief scenarios for umbilical cables of different specifications, a drawer-type counterweight structure is adopted. The drawer-type counterweight consists of several independent counterweights, each weighing 0.5 tons, with symmetrical lifting lugs and transverse positioning threaded holes on both sides. The total load can be adjusted to 30% to 40% of the target umbilical cable safe working load (SWL) by increasing or decreasing the number of counterweights, covering the stress relief requirements of umbilical cables with an SWL ≥ 12.5 kN.

[0038] To meet the mounting requirements of the deep-sea pressure-resistant monitoring cabin and the marine environmental sensing unit, the fixed frame adopts a single-sided open configuration, vertically fixed to the top of the counterweight. Its sidewalls are welded from high-strength alloy square tubes to form a collision-resistant fence structure, providing a stable mounting base for the deep-sea pressure-resistant monitoring cabin and the marine environmental sensing unit. Pressure-reducing holes are provided at the ends of the square tubes to prevent plastic deformation of the frame caused by the high-pressure environment of the deep sea. Meanwhile, the spatial layout of the fixed frame above the counterweight effectively avoids collisions with seabed rocks and provides a buffer space for landing.

[0039] To adapt to complex offshore operating environments, the boom assembly connects to the counterweight via a bidirectional hinge mechanism that runs through the fixed frame. A pre-set bidirectional hinge fixing point at the top of the boom connects to the load-bearing head. Even under complex operating conditions involving the coupling of ocean currents and the ship, the bidirectional hinge mechanism maintains the counterweight in a vertical position. Furthermore, the entire device is cast from corrosion-resistant alloy materials, providing excellent environmental adaptability.

[0040] To address the challenge of deploying long-distance umbilical cables in confined deck spaces, a deep-sea umbilical cable stress relief device is vertically installed on the ship's A-type gantry pulley block. Utilizing the principle of vertical static placement, the cable is slowly lowered into the deep sea using a ship's winch, thus releasing stress on the umbilical cable. This deployment process simultaneously serves as functional verification and technical calibration of the deep-sea equipment deployment and recovery system, ensuring the safe operation of the entire system.

[0041] This invention features the following innovations: 1. Modular counterweight adjustment mechanism: Utilizing a clever drawer-type counterweight structure, the addition or removal of independent counterweights flexibly matches the stress release requirements of umbilical cables of different specifications. Combined with the dual-functional reuse design of symmetrical lifting lugs, it not only facilitates the convenient hoisting and positioning of the counterweights but also serves as a sway-stopping anchor point during the device's deployment at sea. 2. Integrated monitoring and protection frame: A single-sided open fixed frame with side-wall anti-collision structures ensures the safe mounting of the deep-sea pressure-resistant monitoring cabin and environmental sensing unit. The frame's spatial layout effectively avoids the risk of seabed collisions, providing reliable protection for monitoring operations in complex sea conditions. 3. Attitude stabilization structure: A bidirectional hinge mechanism cleverly connects the boom assembly and the counterweight module, adaptively offsetting the coupling effects of ship swaying and ocean current impacts, maintaining the device's vertical operating attitude, and ensuring stability during the stress release process. 4. Deployment and verification collaborative process: The innovative application of a vertical static deployment method simultaneously transforms the process of vertically sinking the device via a marine winch system into a functional verification and calibration mechanism for a deep-sea equipment recovery system, realizing multiple technical values ​​from a single operation.

[0042] The implementation process of the present invention is further illustrated below with reference to specific embodiments (taking a deep-sea umbilical cable with a target load SWL=200kN as an example):

[0043] Step 1, Load Calculation and Counterweight Assembly: Based on the target umbilical cable's safe working load (SWL), calculate the total load required for the stress relief device using the formula: Target Load = SWL × 30% (considering the weight of the suspender assembly and fixed frame, a 30% threshold is used for calculation), thus determining the number of counterweights required. When SWL = 200kN, the target load = 60kN; based on the mass of a single counterweight of 0.5 tons, calculate the number of counterweights: Total mass = Target load / g (g is taken as 9.8m / s²), resulting in a total mass ≈ 6 tons. The number of counterweights is 12, therefore, one first-layer counterweight 401, one bottom-layer counterweight 403, and ten intermediate-layer counterweights 402 are required.

[0044] Step 2, mechanical interlock assembly of counterweights: Step 2.1, the intermediate layer counterweight 402 is horizontally slidable using the lifting lug 404, so that its top protrusion is embedded into the slot structure of the first layer counterweight 401; Step 2.2, Step 2.1 is repeated to complete the stacking of all intermediate layer counterweights 402; Step 2.3, the top of the bottom layer counterweight 403 is interlocked with the last layer intermediate layer counterweight 402; Step 2.4, M20 anti-loosening screws are screwed into the transverse positioning threaded holes 405 of each counterweight, with the torque controlled at 50 N·m, to achieve interlayer transverse displacement constraint.

[0045] Step 3, Hinged assembly of the boom and counterweight: Align the bottom bidirectional hinge fixing point 103 of the boom assembly 100 with the shaft hole of the suspension point 406 of the first-layer counterweight 401, insert the positioning screw 301 and tighten the locking nut 302 to form an adaptive swing pair within the preset pitch angle range, which is -10° to 10°.

[0046] Step 4, Fixed Frame Integration: Insert the fixed frame 200 into the rod assembly 100 from top to bottom, so that its bottom contacts the top surface of the first-layer counterweight 401. Perform continuous sealing welds along the inner side of the fixed frame 200, with a weld height ≥8mm, to ensure connection strength and complete the permanent connection between the fixed frame 200 and the drawer-type counterweight 400.

[0047] Step 5, Monitoring Equipment Deployment and Safety Protection: Step 5.1, Use corrosion-resistant clamps to fix the deep-sea pressure-resistant monitoring cabin and environmental sensing unit to the inside of the anti-collision fence of the fixed frame 200; In this embodiment, 316L stainless steel clamps are used to fix the deep-sea pressure-resistant monitoring cabin (with built-in gyroscope and speed sensor) and the marine environmental sensing unit (depth meter and current meter) to the inside of the anti-collision fence of the fixed frame 200, with a clamp pre-tightening torque of 20 Nd·m. Step 5.2, Secure high-strength nylon anti-sway ropes to the lifting lugs 404 on both sides of the drawer-type counterweight 400, with the other end of the rope anchored to the ship's deck piles to prevent collisions and other safety accidents caused by ship movement and wave impact when the device enters or exits the water. In this embodiment, one 20mm diameter high-strength nylon anti-sway rope is secured to each of the lifting lugs 404 on both sides of the drawer-type counterweight 400, with a rope length of 30m, and the other end is fixed to the ship's deck with ground anchor bolts (ground anchor tension ≥ 100kN).

[0048] Step 6, Load-bearing head connection and ship installation: Connect the top bidirectional hinge fixing point 101 of the boom assembly 100 to the umbilical cable load-bearing head using positioning screws, with a screw pre-tightening torque of 400 Nd·m. Hoist the entire assembly onto the ship's A-type gantry pulley block, adjust it to a vertically suspended state, and ensure the pulley block locking force is ≥100kN. This completes the preparation work before the stress relief device is deployed at sea.

[0049] Step 7, Vertical Deployment and Data Acquisition: Start the ship's winch and, in conjunction with the A-frame, slowly deploy the entire device into the sea at a speed of 1 m / s. Simultaneously execute: Step 7.1, the deep-sea pressure monitoring cabin records parameters such as the number of umbilical cable spins and device attitude in real time; in this embodiment, the deep-sea pressure monitoring cabin records the number of umbilical cable spins and the device's pitch angle once per second; Step 7.2, the sensing unit collects marine environmental data such as water depth and current velocity; in this embodiment, the environmental sensing unit records water depth and ocean current velocity once per second; Step 7.3, stop lowering when the umbilical cable reaches the specified length. In this embodiment, when the umbilical cable deployment length reaches the design value (e.g., 4000 m), stop the winch and allow it to stand for 30 minutes to release stress.

[0050] Step 8, Device Recovery and Data Analysis: The device is recovered to the deck at a constant speed, and then the entire device is dismantled. The number of umbilical cable spins, device attitude stability data, and marine environmental data are analyzed to complete the stress release of the deep-sea umbilical cable. In this embodiment, the device is recovered to the deck at a constant speed of 0.5 m / s, and the device attitude is continuously monitored during the process; the anti-sway rope, monitoring equipment, and fixing frame 200 are removed, and the counterweight is dismantled; the monitoring data is analyzed: if the number of umbilical cable spins is ≤2 and the device pitch angle is ≤5°, the stress release is deemed qualified; at the same time, the deployment and recovery system parameters are calibrated based on water depth and current velocity data.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A deep-sea umbilical cable stress relief device with adjustable load, wherein the deep-sea umbilical cable stress relief device is vertically installed on the A-type gantry pulley block of the deployment vessel, and deep-sea deployment and retrieval are achieved by a marine winch; characterized in that, It includes a boom assembly (100), a fixed frame (200), a two-way hinge mechanism (300), and a drawer-type counterweight (400); the boom assembly (100) passes through the fixed frame (200) and is hinged to the drawer-type counterweight (400) through the two-way hinge mechanism (300); The boom assembly (100) includes a vertical rod (102), a top bidirectional hinge fixing point (101) and a bottom bidirectional hinge fixing point (103) located at both ends of the boom assembly (100); the top bidirectional hinge fixing point (101) is used to connect the deep-sea umbilical cable bearing head; the bottom bidirectional hinge fixing point (103) is connected to the drawer-type counterweight (400), forming a two-degree-of-freedom swing system to maintain the vertical operating posture of the deep-sea umbilical cable stress relief device; The fixed frame (200) adopts a single-sided open topology structure. Its sidewalls are formed by orthogonally welding multiple alloy square tubes to form a grid-like protective fence. The middle of its top surface and the middle of its bottom surface are reserved for the movement space of the hanging rod assembly (100). The bottom of the fixed frame (200) is connected to the drawer-type counterweight (400) by welding. The drawer-type counterweight (400) includes a first-layer counterweight (401), multiple intermediate-layer counterweights (402) and a bottom-layer counterweight (403); the top of the first-layer counterweight (401) is flat, and a hanging point (406) is provided in the middle position, and the hanging point (406) is connected to the bottom bidirectional hinge fixing point (103); The top of the multiple intermediate counterweights (402) and the bottom counterweight (403) are provided with protruding structures, and the bottom of the first counterweight (401) and the multiple intermediate counterweights (402) are provided with slot structures that match the protruding structures, thereby limiting the longitudinal displacement of the intermediate counterweights (402); the bottom surface of the bottom counterweight (403) is a flat ground base to ensure that the entire device is landed stably; all counterweights are provided with 4 symmetrical lifting lugs (404) and transverse positioning threaded holes (405).

2. The adjustable load deep-sea umbilical cable stress relief device according to claim 1, characterized in that, The bidirectional hinge mechanism (300) includes a positioning screw (301) and a locking nut (302). The bottom bidirectional hinge fixing point (103) of the rod assembly (100) is aligned with the shaft hole of the suspension point (406) of the first-layer counterweight block (401). After inserting the positioning screw (301), the locking nut (302) is tightened to form an adaptive swing pair within a preset pitch angle range.

3. The adjustable load deep-sea umbilical cable stress relief device according to claim 1, characterized in that, The mass of a single independent counterweight is 0.5 tons, and the protruding structure and the slot structure form an arc-shaped interlocking structure.

4. The adjustable load deep-sea umbilical cable stress relief device according to claim 1, characterized in that, The lifting lug (404) has a dual function: on the one hand, it serves as a force-bearing interface for the lifting, transportation and deck installation of the independent counterweight; on the other hand, it serves as an anti-sway anchor point when the device is deployed at sea; and it suppresses the risk of collision caused by ship swaying by securing the anti-sway rope. The anti-sway rope is a high-strength nylon rope with a diameter ≥20mm. One end is secured to the lifting lug (404), and the other end is fixed to the ship deck by a ground anchor bolt with a rated tensile force ≥100kN.

5. The adjustable load deep-sea umbilical cable stress relief device according to claim 2, characterized in that, The preset pitch angle range is -10° to 10°.

6. The adjustable load deep-sea umbilical cable stress relief device according to claim 2, characterized in that, It also includes a deep-sea pressure-resistant monitoring cabin and a marine environment sensing unit; the deep-sea pressure-resistant monitoring cabin and the marine environment sensing unit are fixed to the inside of the anti-collision fence of the fixed frame (200) by anti-corrosion clamps.

7. The adjustable load deep-sea umbilical cable stress relief device according to claim 1, characterized in that, The fixed frame (200) has pressure-reducing through holes at the ends of the square tubes on its side walls, which can prevent plastic deformation of the frame caused by the high pressure environment in the deep sea. At the same time, the space above the drawer-type counterweight (400) of the fixed frame (200) can effectively avoid collisions with seabed rocks and provide a landing buffer space. The total load can be adjusted to 30% to 40% of the target umbilical cable safe working load SWL by increasing or decreasing the number of counterweights of the drawer-type counterweight (400), so as to meet the stress release requirements of the umbilical cable with SWL≥12.5kN.

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