An FPSO module pier self-sensing system and self-sensing method

Abstract

The present invention discloses a self-sensing system and a self-sensing method for FPSO module piers, including a sliding device, a limiting device, a self-sensing system and a hydraulic system, wherein the sliding device includes a pier top plate and a leg bottom plate, and limiting devices are installed on both the front and rear sides of the pier top plate, and a hydraulic system is connected between the pier top plate and the leg bottom plate on the same side, and a self-sensing system is installed on the pier top plate, and the limiting device, the self-sensing system and the hydraulic system are all connected to a control system. The present invention adopts rolling friction instead of sliding friction, and uses an inclination sensor and a single-chip microcomputer to control the hydraulic system. Even if the hull undergoes a small deformation, relative movement can be immediately generated between the leg bottom plate and the pad, avoiding the phenomenon of stress concentration and ensuring the safety of the upper module; the limiting device ensures that the relative displacement between the leg bottom plate and the pad does not exceed the relative displacement value between adjacent piers, ensuring that the leg bottom plate will not be separated from the roller.

Description

Technical Field

[0001] The present invention relates to a self - sensing system for module piers, and particularly to a self - sensing system and method for FPSO module piers. Background Art

[0002] An FPSO is a comprehensive large - scale offshore oil production base integrating production, oil storage, external transportation, living, power generation, etc. Utilizing its characteristics of easy transportation, storage, and movable position for exploitation, it reduces the exploitation cost of small oil and gas fields and associated oil and gas fields, and maximizes the development benefits of marginal resources.

[0003] There are various oil and gas treatment modules arranged above the main deck of the FPSO. The framework platforms of each module are connected to the main hull through module pier structures. Module piers are divided into two forms, one is a fixed pier and the other is a sliding pier. A fixed pier means that the leg bottom plate of the module framework platform is directly welded to the pier top plate, and a sliding pier means that the leg bottom plate and the pier top plate are in sliding contact. Since seawater contains more electrolytes, the facilities on the FPSO are prone to electrochemical corrosion and rusting. Therefore, when the main hull of the FPSO generates a longitudinal bending, some leg bottom plates cannot overcome the sliding friction force between them and the pier top plate, which will cause the legs of the module framework platform to be forced to deform along with the longitudinal bending deformation of the hull girder, thus greatly increasing the probability of fatigue cracks occurring in the legs and piers. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to propose a self - sensing system and method for FPSO module piers, which can immediately realize the relative movement between the leg bottom plate and the backing plate under the condition of small deformation of the hull girder, and can ensure that the relative displacement between the leg bottom plate and the backing plate does not exceed the relative displacement value between adjacent piers.

[0005] Technical Solution: The present invention includes a sliding device, a limiting device, a self - sensing system, and a hydraulic system. The sliding device includes a pier top plate and a leg bottom plate. Limiting devices are installed on both the front and rear sides of the pier top plate. A hydraulic system is connected between the pier top plate and the leg bottom plate on the same side. A self - sensing system is installed on the pier top plate. The limiting device, the self - sensing system, and the hydraulic system are all connected to a control system.

[0006] The limiting device includes a limit switch. The contact of the limit switch is at the same horizontal position as the leg bottom plate, and the limit switch is connected to the control system.

[0007] When the distance between the contact of the limit switch on one side of the leg bottom plate and the side surface of the leg bottom plate on this side is the relative displacement value between adjacent piers, the contact of the limit switch on the other side is in contact with the side surface of the leg bottom plate on this side.

[0008] The hydraulic system includes a hydraulic station and multiple hydraulic cylinders. The pier top plate and the leg bottom plate on the same side are connected by multiple hydraulic cylinders.

[0009] The hydraulic station is equipped with a reversing valve, and the reversing valve is connected to the control system.

[0010] The self-sensing system uses an inclination sensor, which can immediately realize the relative movement between the leg bottom plate and the backing plate even when the hull girder undergoes a small deformation.

[0011] The control system uses an electric control box. A single-chip microcomputer and a relay are provided inside the electric control box. The single-chip microcomputer is connected to the inclination sensor, and the relative movement between the leg bottom plate and the backing plate can be immediately realized even when the hull girder undergoes a small deformation.

[0012] A backing plate is provided on the top of the pier top plate, and several rollers are provided between the backing plate and the leg bottom plate to facilitate the relative movement between the leg bottom plate and the backing plate.

[0013] The limit switch is installed on the upper surface of the pier top plate through a spacer block.

[0014] A self-sensing method for the self-sensing system of an FPSO module pier includes the following steps:

[0015] (1) When the ship is in a stationary state and the power supply is disconnected, the reversing valve is in the middle position at this time, and the leg bottom plate remains stationary.

[0016] (2) When the pier top plate is in an inclined state, the inclination sensor tilts accordingly and sends a signal. After the single-chip microcomputer receives the signal, the circuit is energized, and the hydraulic cylinder retracts, driving the leg bottom plate to move towards the stern of the ship. When the leg bottom plate touches the contact of the limit switch on this side, the power supply is disconnected, and the reversing valve switches to the middle position, and the leg bottom plate stops at this position.

[0017] (3) When the pier top plate is in a horizontal state, the inclination sensor is balanced accordingly and sends a signal. After the single-chip microcomputer receives the signal, the circuit is energized, and the hydraulic cylinder extends, driving the leg bottom plate to move towards the bow of the ship.

[0018] Beneficial effects: The present invention uses rolling friction instead of sliding friction, and uses an inclination sensor and a single-chip microcomputer to control the hydraulic system. Even when the hull undergoes a small deformation, relative movement can be immediately generated between the leg bottom plate and the backing plate, avoiding the phenomenon of stress concentration and ensuring the safety of the upper module; the limiting device ensures that the relative displacement between the leg bottom plate and the backing plate does not exceed the relative displacement value between adjacent piers, ensuring that the leg bottom plate will not be separated from the rollers. Description of the Drawings

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

[0020] Figure 2 is a top view schematic diagram of the overall structure of the present invention;

[0021] Figure 3 is Figure 2 an enlarged view of the H position of

[0022] Figure 4 is a front view sectional schematic diagram of the electric control box of the present invention;

[0023] Figure 5 is a top view sectional schematic diagram of the electric control box of the present invention;

[0024] Figure 6 is a schematic diagram of the principle of the self - induction sliding system of the present invention;

[0025] Figure 7 is a schematic diagram of the arrangement of the limit switches of the present invention;

[0026] Figure 8 is Figure 7 an enlarged view of the G position in Detailed implementation manner

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] As Figures 1 to 6 shown, the present invention includes a sliding device, a limiting device, a self - induction system, and a hydraulic system. The sliding device includes a pier top plate 1 and a pier rear side plate 11. A support plate 12 is provided between the pier top plate 1 and the pier rear side plate 11 to support the part of the pier top plate 1 extending outside the pier. A cushion plate 6 is provided on the top of the pier top plate 1. Above the cushion plate 6 is provided a leg bottom plate 8. Between the leg bottom plate 8 and the cushion plate 6 are provided a number of rollers 7. The contact surface between the cushion plate 6 and the rollers 7 is 10 mm lower than the upper surface of the cushion plate 6, and the connection between the contact surface and the upper surface of the cushion plate 6 is in a circular arc transition, thereby restricting the moving distance of the rollers 7 and preventing the rollers 7 from detaching from the cushion plate 6. The rolling friction between the rollers 7 and the leg bottom plate 8 and the cushion plate 6 is less than the sliding friction between the leg bottom plate 8 and the pier top plate 1, facilitating the relative movement between the leg bottom plate 8 and the cushion plate 6.

[0029] Limit devices are installed on both the front and rear sides of the pier top plate 1. As Figure 7 and Figure 8As shown in the figure, the limiting device includes a limit switch 28. The limit switches 28 on both sides are installed on the upper surface of the pier top plate 1 through pads 4, and the contacts of the limit switches 28 are at the same horizontal position as the leg bottom plate 8. The limit switches 28 on both sides are respectively connected to the interfaces p and q of the electric control box 19 through wires. The distance between the contact of the limit switch 28 on one side of the pier and the side of the leg bottom plate 8 on the same side is the relative displacement value between adjacent piers. The contact of the limit switch 28 on the other side of the pier just fits the side of the leg bottom plate 8 on the same side. The limiting device is used to ensure that the leg bottom plate will not separate from the roller, and to ensure that the relative displacement between the leg bottom plate and the backing plate does not exceed the relative displacement value between adjacent piers.

[0030] The self-induction system includes an inclination sensor 9 fixed on the upper surface of the pier top plate 1. The inclination sensor 9 is a wireless inclination sensor, such as Figure 1 and Figure 2 shown. The accuracy of the inclination sensor 9 is very high. Even when the hull girder undergoes a small deformation, the relative movement between the leg bottom plate and the backing plate can be immediately realized. The inclination sensor 9 is connected to the single-chip microcomputer 20 inside the electric control box 19. There are also multiple relays 21 inside the electric control box 19. In this embodiment, there are two relays 21. One output port r of the single-chip microcomputer 20 is connected in series with the relay 21 and the magnet coil on the left side of the reversing valve. Another output port s of the single-chip microcomputer 20 is connected in series with another relay 21 and the magnet coil on the right side of the reversing valve. Both relays 21 are in the normally open state. When the circuit where the relay 21 is located is energized, the relay 21 closes.

[0031] The hydraulic system includes a hydraulic station 23 and multiple hydraulic cylinders 13. Multiple hydraulic cylinders 13 are connected between the pier top plate 1 and the leg bottom plate 8 on the same side. In this embodiment, there are two hydraulic cylinders 13. The cylinder head earring of the hydraulic cylinder 13 is fixed to the second ear plate 10 welded on the leg bottom plate 8 through a pin shaft, and the cylinder bottom earring is also fixed to the first ear plate 2 welded on the pier top plate 1 through a pin shaft. Thus, the movement of the leg bottom plate 8 is driven by the telescopic movement of the piston rod of the hydraulic cylinder 13.

[0032] A three-position four-way electromagnetic reversing valve is installed on the hydraulic station 23. The magnet coil on the left side of the reversing valve is connected to the interface m of the electric control box 19 through a wire, and the magnet coil on the right side is connected to the interface n of the electric control box 19 through a wire. The oil ports c and e of the two hydraulic cylinders 13 are both connected to the oil port A of the reversing valve through oil pipes 26. The oil ports d and f of the two hydraulic cylinders 13 are both connected to the oil port B of the reversing valve through oil pipes.

[0033] The working principle of the present invention is as follows: According to the main dimensions of the FPSO, the sectional characteristics of the midship structure section, and the longitudinal bending moment of the whole ship, the relative deformation value of the hull girder at the main deck is calculated, and then according to the distance between adjacent module piers, the relative displacement value generated by the bending of the hull girder between adjacent piers is calculated. The above calculation process can be determined according to existing empirical formulas.

[0034] A self-sensing method for an FPSO module pier self-sensing system includes the following steps:

[0035] (1) When the ship is in a stationary state and the power supply is disconnected, the directional control valve is in the middle position at this time, and hydraulic oil cannot enter the hydraulic cylinder. The piston and the piston rod do not move, and the leg bottom plate remains stationary.

[0036] (2) When the pier top plate is in an inclined state, the wireless inclination sensor tilts accordingly and sends out a signal. After the single-chip microcomputer receives the signal, the circuit in which the output port r of the single-chip microcomputer is connected in series with the relay and the right coil of the directional control valve is energized. At this time, the directional control valve switches to the right position, and the hydraulic oil enters the rod chamber of the hydraulic cylinder through the right position of the directional control valve, causing the piston and the piston rod to retract. The piston rod drives the leg bottom plate to move towards the stern of the ship. The leg bottom plate moves to the next position, and the distance between this position and the initial position is exactly the relative displacement value between adjacent piers. At this time, the leg bottom plate touches the contact of another limit switch, the power supply is disconnected, the directional control valve switches to the middle position, and the leg bottom plate stops at this position without moving.

[0037] (3) When the pier top plate is in a horizontal state, the wireless inclination sensor is balanced accordingly and sends out a signal. After the single-chip microcomputer receives the signal, the circuit in which the output port s of the single-chip microcomputer is connected in series with the relay and the left coil is energized, and the directional control valve switches to the left position. The hydraulic oil enters the rodless chamber of the hydraulic cylinder through the left position of the directional control valve, pushing the piston and the piston rod to extend outwards. The piston rod drives the leg bottom plate to move towards the bow of the ship.

[0038] The hydraulic cylinder 13 in the above steps is arranged at the rear side of the pier top plate 1 and the leg bottom plate 8. When the hydraulic cylinder 13 is arranged at the front side of the pier top plate 1 and the leg bottom plate 8, the self-sensing method is similar by analogy.

Claims

1. An FPSO module pier self-induction system, characterized in that It includes a sliding device, a limiting device, a self-sensing system and a hydraulic system. The sliding device includes a pier top plate and a leg bottom plate. Limiting devices are installed on both the front and rear sides of the pier top plate. A hydraulic system is connected between the pier top plate and the leg bottom plate on the same side. A self-sensing system is installed on the pier top plate. The limiting device, the self-sensing system and the hydraulic system are all connected to a control system; The limiting device includes a limit switch. The contact of the limit switch is at the same horizontal position as the leg bottom plate. The limit switch is connected to the control system. The distance between the contact of the limit switch on one side of the leg bottom plate and the side surface of the leg bottom plate on this side is the relative displacement value between adjacent piers; the contact of the limit switch on the other side is in contact with the side surface of the leg bottom plate on this side. The hydraulic system includes a hydraulic station and multiple hydraulic cylinders. The pier top plate and the leg bottom plate on the same side are connected by multiple hydraulic cylinders. A reversing valve is installed on the hydraulic station. The reversing valve is connected to the control system. The self-sensing system uses an inclination sensor. The inclination sensor is arranged on the pier top plate. The control system uses an electric control box. A single-chip microcomputer and a relay are arranged in the electric control box. The single-chip microcomputer is connected to the inclination sensor. A cushion plate is arranged on the top of the pier top plate. A number of rollers are arranged between the cushion plate and the leg bottom plate.

2. The self-induction system for FPSO module pier according to claim 1, characterized in that, The limit switch is installed on the upper surface of the pier top plate through a spacer block.

3. A self-sensing method for the FPSO module pier self-sensing system according to any one of claims 1 to 2, characterized in that, It includes the following steps: (1) When the ship is in a stationary state and the power is off, the reversing valve is in the middle position at this time, and the leg bottom plate remains stationary; (2) When the pier top plate is in an inclined state, the inclination sensor tilts accordingly and sends out a signal. After the single-chip microcomputer receives the signal, the circuit is powered on, the hydraulic cylinder retracts, driving the leg bottom plate to move towards the stern of the ship. When the leg bottom plate touches the contact of the limit switch, the power is off, and the reversing valve switches to the middle position, and the leg bottom plate stops moving; (3) When the pier top plate is in a horizontal state, the inclination sensor is balanced accordingly and sends out a signal. After the single-chip microcomputer receives the signal, the circuit is powered on, the hydraulic cylinder extends, driving the leg bottom plate to move towards the bow of the ship.

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