Floating barrel locking device of inner turret single-point system

Abstract

The invention discloses an inner turret single-point system buoy locking device, which relates to the technical field of ocean engineering equipment and comprises a mechanical locking system, an online state detection system and a hydraulic control system. The mechanical locking system is composed of N pairs of hydraulic tongs, namely 2N pairs of hydraulic tongs, every two hydraulic tongs form a pair, the N pairs of hydraulic tongs are evenly distributed, and the included angles of the two hydraulic tongs in each pair of hydraulic tongs are consistent. The hydraulic control system achieves step-by-step segmented clamping force adjustment through eight clamping oil cylinders connected in parallel, four sets of electromagnetic reversing valves and a stacked pressure reducing valve. The on-line state detection system monitors clamping force in real time through a pressure sensor installed on a pressing block at the front end of the hydraulic tongs, and the clamping force is analyzed and early warned through a PLC data collecting and processing unit. According to the device, the specific layout of the hydraulic tongs is combined with the guide sliding plate and the sliding bearing, and grouped closed-loop hydraulic control, real-time state monitoring and graphene anticorrosive coating are performed, so that high-precision self-adaptive locking of the buoy is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore engineering equipment, and particularly relates to a floating cylinder locking device of an inner turret single point system. BACKGROUND

[0002] The inner turret single point mooring system is the core equipment in the development of offshore oil and gas, which is composed of a mooring device, a conical floating cylinder, a hydraulic operating system and the like, and is used for mooring a floating production storage and offloading device (FPSO) to make the FPSO rotate around a single point with wind, waves and water flow, and to realize crude oil transportation and power transmission through a switching structure. In the system, the floating cylinder locking device is a key stressed component, which is responsible for transmitting the vertical load of the underwater anchor and the riser cable to the ship structure, and realizing quick locking and release when the storage device is connected with the floating cylinder or is maintained.

[0003] However, the existing locking device has the following defects: firstly, the reliability is insufficient, the traditional mechanical structure is easy to fail due to corrosion or biological attachment in the harsh marine environment, which leads to loose locking and threatens the safety of the system; secondly, the operation is complex, the locking process relies on manual intervention, the response speed is slow, and it is difficult to adapt to the precise positioning requirement of the dynamic lifting of the floating cylinder to the single point cabin; thirdly, the maintenance cost is high: the hydraulic drive unit lacks grouping control and closed-loop feedback, has a high failure rate, and the maintenance needs to frequently replace spare parts, which increases the operation and maintenance burden; and fourthly, the corrosion resistance is poor: the conventional coating has weak impermeability, and seawater easily corrodes the metal components, which shortens the service life of the device.

[0004] Therefore, there is an urgent need for an inner turret floating cylinder locking device with high reliability, fast response, low maintenance cost and corrosion resistance to solve the above technical problems. SUMMARY

[0005] In order to solve the above technical problems, the present application provides an inner turret single point system floating cylinder locking device. The present application realizes high-precision self-adaptive locking of the floating cylinder through the uniformly distributed hydraulic tongs, grouping closed-loop hydraulic control, real-time state monitoring and graphene corrosion-resistant coating.

[0006] To achieve the above purpose, the present application provides an inner turret single point system floating cylinder locking device, comprising: a mechanical locking system, an online state detection system and a hydraulic control system. The mechanical locking system is composed of N pairs of 2N hydraulic tongs, wherein each two hydraulic tongs form a pair, the N pairs of hydraulic tongs are uniformly distributed, and the included angle of the two hydraulic tongs in each pair of hydraulic tongs is consistent, and N is greater than or equal to 3; The online state detection system monitors the working state and stress data of the hydraulic tongs of the mechanical locking system in real time through a pressure sensor, and transmits the data to a PLC data acquisition and processing unit for analysis, alarm and early warning; The hydraulic control system connects the mechanical locking system through a hydraulic circuit, provides locking force for the hydraulic clamp of the mechanical locking system, and controls locking and releasing; The mechanical locking system is driven by the hydraulic control system to perform locking action, and realizes state feedback and control closed loop through the online state detection system.

[0007] Further, each hydraulic clamp of the mechanical locking system comprises a hydraulic drive cylinder, a clamp body, a base, a sliding bearing, a guide slide plate, and a locking nut. The hydraulic drive cylinder is connected with the clamp body through a pin shaft. The base limits and fixes the clamp body. The sliding bearing is arranged at the bottom of the hydraulic clamp, and is used to bear the rotation and transverse sliding of the clamp during clamping and releasing. The guide slide plate is arranged in the base, and is used to guide the movement of the clamp body. The locking nut is used to fix the locking state after the clamp action is in place.

[0008] Further, when the hydraulic rod of the hydraulic drive cylinder is extended, the clamp body is pushed to move along the guide slide plate to approach the buoy position, the clamp body moves in the guide slide plate of the base, and after approaching the buoy, the clamp body is connected and locked with the buoy by using step-by-step segmented control of clamping force, and after the clamp action is in place, the locking nut is tightened by using a special tool.

[0009] Further, the hydraulic control system comprises a hydraulic power source, eight clamping oil cylinders of the hydraulic clamp, four groups of electromagnetic reversing valves, and superimposed pressure reducing valves. The hydraulic power source is provided by a secondary hydraulic station. The eight clamping oil cylinders are arranged in a parallel form, and the oil inlet and the oil outlet are provided with ball valves. The four groups of electromagnetic reversing valves and superimposed pressure reducing valves are used to form four different working pressures to adapt to different loading stages.

[0010] Further, in the hydraulic control system, two oil cylinders at opposite angles form a group, each group of oil cylinders acts independently, and the hydraulic clamping and releasing are controlled in groups; the clamping force is controlled by using step-by-step segmented control, and the clamping force is controlled in a closed loop by a proportional pressure reducing valve and a pressure sensor.

[0011] Further, the online state detection system comprises an instrument detection unit, a PLC data acquisition and processing unit, a wireless communication unit, and an upper monitoring unit; the instrument detection unit comprises a pressure sensor installed on the front end block of the hydraulic clamp, is used to detect the working state and stress condition of the hydraulic clamp, and transmits data to the PLC data acquisition and processing unit for analysis and calculation, and transmits the data to the upper monitoring unit through the wireless communication unit for display, archiving, and alarm.

[0012] Further, the surface of the hydraulic tongs is coated with graphene-coated titanium nanometer heavy-duty paint, which uses the small-scale effect of nanometer titanium powder to improve the dispersibility of graphene in resin, realizes impermeability and bactericidal property through the graphene sheet structure, and avoids the contact of seawater with the metal and the attachment of marine organisms.

[0013] Further, the mechanical locking system, online state detection system and hydraulic control system are integrated in the inner turret single point mooring system, which is used for transmitting the vertical load of the underwater anchor system and the riser cable system to the ship structure through the buoy, and realizing the quick connection and release of the buoy and the storage device.

[0014] Compared with the prior art, the present application has the following advantages: 1. The inner turret single point system buoy locking device provided by the present application realizes self-adaptive position adjustment in the buoy locking process through the layout of the pair of uniformly distributed hydraulic tongs combined with the guide slide plate and the semicircular sliding bearing in the base; the diagonal oil cylinder group control and the step-by-step segmented clamping force strategy are adopted in the hydraulic system, which significantly improves the locking precision and response speed and ensures the stable transmission of the anchor vertical load in the seawater immersion environment.

[0015] 2. The inner turret single point system buoy locking device provided by the present application realizes real-time analysis of the clamping force data of the front end block of the hydraulic tongs through the proportional pressure reducing valve and the pressure sensor to form a closed loop control, and cooperates with the PLC data acquisition unit of the online monitoring system to realize automatic alarm and early warning when exceeding the limit; combined with the remote electric control function, the demand for manual intervention is greatly reduced, and safety accidents caused by locking failure are avoided.

[0016] 3. The inner turret single point system buoy locking device provided by the present application is coated with graphene-coated titanium nanometer heavy-duty paint on the surface of the hydraulic tongs, which uses nanometer titanium powder to enhance the dispersibility of graphene, forms a dense sheet structure, resists seawater penetration and inhibits marine organism attachment, solves the problem of electrochemical corrosion of traditional metal parts in a salt spray environment, and prolongs the service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Fig. 1 It is a schematic diagram of the four pairs of hydraulic tongs structure of the inner turret single point system buoy locking device in the embodiments of the present application. Fig. 2A hydraulic clamp structure schematic diagram in a floating cylinder locking device of an inner rotating tower single point system in an embodiment of the present application; Fig. 3 A three-dimensional structure schematic diagram of a hydraulic clamp in a floating cylinder locking device of an inner rotating tower single point system in an embodiment of the present application.

[0019] In the figure: 1, hydraulic drive cylinder; 2, clamp main body; 3, base; 4, sliding bearing; 5, guide sliding plate; 6, locking nut; 7, mechanical locking system; 8, online state detection system; 9, hydraulic control system. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0023] The foregoing description, for purposes of clarity, describes the present application in terms of its components, processes and operations. Such descriptions and representations are the means used by those skilled in the art of describing the physical structure, configuration and operation of implementations of the present application. However, the application is not limited to the descriptions and representations. Although the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications can be practiced within the scope of the appended claims. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the present application is not to be limited to the details given herein, but can be modified within the scope and range of equivalents of the appended claims. In the claims, means-plus-function clauses, if used, are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Thus although different goods or methods can not be patentably equivalent to one another, they can be within the equivalent structure for activities recited in the means-plus-function clauses.

[0024] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the outline of each component itself.

[0025] For the convenience of description, spatial relative terms such as "above", "upper", "on", "top", "bottom", etc. can be used herein to describe the spatial relationship of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0026] In addition, it should be noted that the use of the words "first", "second", and the like, to describe various components, is merely intended to differentiate one component from another, and does not imply a special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0027] Embodiments AsFigs. 1 to 3 As shown, the present application provides a floating lock device for inner rotating tower single-point system, comprising: a mechanical locking system 7, an online state detection system 8, and a hydraulic control system 9; The mechanical locking system 7 is composed of four pairs of eight hydraulic clamps, each pair of hydraulic clamps is distributed at 90°, and the two hydraulic clamps in each pair are arranged at an angle of 30°. The online state detection system 8 monitors the working state and stress data of the hydraulic clamps of the mechanical locking system 7 in real time through pressure sensors, and transmits the data to the PLC data acquisition and processing unit for analysis, alarm and early warning. The hydraulic control system 9 connects the mechanical locking system 7 through a hydraulic circuit, provides locking force for the hydraulic clamps of the mechanical locking system 7, and controls locking and release. The mechanical locking system 7 is driven by the hydraulic control system 9 to execute locking action, and realizes state feedback and control closed loop through the online state detection system 8.

[0028] Further, each hydraulic clamp of the mechanical locking system 7 comprises a hydraulic drive cylinder 1, a clamp body 2, a base 3, a sliding bearing 4, a guide sliding plate 5, and a locking nut 6. The hydraulic drive cylinder 1 is connected with the clamp body 2 through a pin shaft, the base 3 fixes the clamp body 2 and internally embeds the guide sliding plate 5 to limit the moving track, the sliding bearing 4 is arranged at the bottom of the hydraulic clamp to bear the rotation and transverse sliding of the clamp during clamping and releasing, the locking nut 6 is used to fix the locking state after the clamp action is in place, and the guide sliding plate 5 and the sliding bearing 4 ensure the moving precision and position self-adaptation. Hydraulic clamp locking action: the hydraulic rod of the hydraulic drive cylinder 1 extends to push the clamp body 2 to move along the guide sliding plate 5 in the base 3 towards the floating tube; After the clamp body 2 approaches the floating tube, the hydraulic control system 9 starts to control the clamping force in stages, and divides the pressure into four levels to make the clamp body 2 clamp the floating tube; After the clamping action is completed, the locking nut 6 is tightened using a special tool to fix the locking state; Hydraulic clamp releasing action: the hydraulic rod retracts, the clamp body 2 retreats along the guide sliding plate 5 to disengage from the floating tube, and the sliding bearing 4 assists transverse sliding.

[0029] Further, when the hydraulic rod of the hydraulic drive cylinder 1 extends to push the clamp body 2 to move along the guide sliding plate 5 to approach the floating tube, the clamp body 2 moves in the guide sliding plate 5 of the base 3, and after approaching the floating tube, the clamping force is controlled in stages to make the clamp body 2 connect and lock the floating tube, the clamp action is executed in place, the locking nut 6 is tightened using a special tool, the impact load is avoided through segmented control, the floating tube structure is protected, and secondary mechanical fixation is provided through the locking nut 6.

[0030] Further, the hydraulic control system 9 includes a hydraulic power source, eight hydraulic clamp cylinders, four sets of electromagnetic reversing valves, and a superimposed pressure reducing valve. The hydraulic power source is provided by a secondary hydraulic station. The eight hydraulic cylinders are arranged in parallel, and the parallel oil circuit design improves system redundancy. Ball valves are provided at the oil inlet and outlet. The four sets of electromagnetic reversing valves and the superimposed pressure reducing valve are used to form four different working pressures to adapt to different loading stages. Multi-stage pressure control reduces energy consumption and adapts to complex working conditions.

[0031] Further, in the hydraulic control system 9, two oil cylinders at opposite angles form a group, each group of oil cylinders acts independently, and hydraulic clamping and release are controlled in groups. By grouping control, single point failure is avoided. The clamping force is controlled step by step in sections. The clamping force is controlled in a closed loop by a proportional pressure reducing valve and a pressure sensor. The proportional pressure reducing valve adjusts the clamping force dynamically according to the feedback of the pressure sensor, improves the closed loop regulation accuracy, and meets the dynamic load demand. The hydraulic control system 9 control process: two oil cylinders at opposite angles form a group, a total of four groups, each group is controlled independently; In the clamping stage, the pressure is gradually increased in four stages. In the closed loop control stage, the proportional pressure reducing valve adjusts the clamping force in real time according to the feedback of the pressure sensor. In the release stage, the hydraulic oil flows in the opposite direction, and the oil cylinder contracts.

[0032] Further, the online state detection system 8 includes an instrument detection unit, a PLC data acquisition and processing unit, a wireless communication unit, and an upper monitoring unit. The instrument detection unit includes a pressure sensor installed on the front end block of the hydraulic clamp. It is used to detect the working state and stress condition of the hydraulic clamp in real time, and transmit the data to the PLC data acquisition and processing unit for analysis and calculation. The PLC calculates the stress threshold value, generates a warning signal when it exceeds the limit, and transmits it to the upper monitoring unit for display and alarm through the wireless communication unit. The data is transmitted wirelessly to the upper unit to display real-time curves and archive historical data.

[0033] Further, the surface of the hydraulic clamp is coated with graphene-coated titanium nanometer heavy-duty paint. The paint uses the small scale effect of nano titanium powder to improve the dispersibility of graphene in resin. The graphene sheet structure realizes permeability and sterilization, avoids contact between seawater and metal and attachment of marine organisms, avoids electrochemical corrosion, and prolongs the service life.

[0034] Further, the mechanical locking system 7, the online state detection system 8, and the hydraulic control system 9 are integrated into the internal turret single point mooring system. It is used to transmit the vertical load of the underwater anchor system and the riser cable system to the ship structure through the buoy, and to realize the quick connection and release of the buoy and the storage device, and to meet the stable operation of the mooring system in seawater immersion environment.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A buoy locking device for a single-point system of an inner turret, characterized in that: include: Mechanical locking system, online status detection system, hydraulic control system; The mechanical locking system is composed of N pairs of 2N hydraulic tongs, wherein each pair of two hydraulic tongs is evenly distributed, and the angle between the two hydraulic tongs in each pair of hydraulic tongs is consistent, wherein N ≥ 3; The online status detection system monitors the working status and force data of the hydraulic tongs of the mechanical locking system in real time through the pressure sensor, and transmits the data to the PLC data acquisition and processing unit for analysis, alarm and early warning; The hydraulic control system is connected to the mechanical locking system through a hydraulic circuit, providing locking force for the hydraulic tongs of the mechanical locking system and controlling locking and releasing; The mechanical locking system is driven by a hydraulic control system to perform locking actions, and realizes state feedback and control closed loop through an online state detection system.

2. The inner turret single point system buoy locking device according to claim 1, characterized in that: Each hydraulic tong of the mechanical locking system comprises a hydraulic drive cylinder, a tong body, a base, a sliding bearing, a guide slide and a locking nut; The hydraulic drive cylinder is connected to the tongs body via a pin; The base has a limiting and fixing effect on the tongs body; The sliding bearing is provided at the bottom of the hydraulic tongs and is used to withstand the rotation and lateral sliding of the tongs during clamping and releasing; The guide slide is arranged in the base and is used to guide the movement of the tongs body; The locking nut is used to fix the locking state after the clamp is moved into place.

3. The inner turret single point system buoy locking device according to claim 2, characterized in that: When the hydraulic rod of the hydraulic drive cylinder is extended, the tongs body is pushed to move along the guide slide to a position close to the buoy. The tongs body moves within the guide slide of the base. After approaching the buoy, the clamping force is controlled step by step to connect the tongs body to the locking buoy. After the clamping action is performed and the tongs are in place, the locking nut is tightened by a special tool.

4. The inner turret single point system buoy locking device according to claim 1, characterized in that: The hydraulic control system includes a hydraulic power source, eight hydraulic clamping cylinders, four sets of electromagnetic reversing valves and a superimposed pressure reducing valve; The hydraulic power source is provided by the auxiliary hydraulic station; The eight clamping cylinders are arranged in parallel, and ball valves are provided at the oil inlets and outlets; The four groups of electromagnetic reversing valves and superimposed pressure reducing valves are used to form four different working pressures to adapt to different loading stages.

5. The inner turret single point system buoy locking device according to claim 4, characterized in that: In the hydraulic control system, two diagonally opposed cylinders form a group, each group of cylinders operates independently, and hydraulic clamping and release are controlled by group; the clamping force is controlled in a step-by-step manner, and the clamping force forms a closed-loop control through a proportional pressure reducing valve and a pressure sensor.

6. The inner turret single point system buoy locking device according to claim 1, characterized in that: The online status detection system includes an instrument detection unit, a PLC data acquisition and processing unit, a wireless communication unit and an upper monitoring unit; the instrument detection unit includes a pressure sensor installed on the front end pressure block of the hydraulic tongs, which is used to detect the working status and stress conditions of the hydraulic tongs, and transmit the data to the PLC data acquisition and processing unit for analysis and calculation, and transmit it to the upper monitoring unit through the wireless communication unit for display, archiving and alarm.

7. The inner turret single point system buoy locking device according to claim 1, characterized in that: The surface of the hydraulic tongs is coated with a graphene-coated titanium nano heavy-duty anti-corrosion coating. The coating utilizes the small-scale effect of nano-titanium powder to enhance the dispersion of graphene in the resin, and achieves anti-permeability and bactericidal properties through the graphene sheet structure, thereby preventing seawater from contacting the metal and preventing marine organisms from attaching.

8. The buoy locking device of the inner turret single point system according to any one of claims 1 to 7, characterized in that: The mechanical locking system, online status detection system and hydraulic control system are integrated into the inner turret single-point mooring system, which is used to transfer the vertical load of the underwater anchoring and riser cable system to the hull structure through the buoy, and realize the rapid connection and release of the buoy and the oil storage device.

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