Magnetic suspension disc type winding machine and ocean heave compensation system

Abstract

The invention relates to the technical field of ocean heave compensation, in particular to a magnetic suspension disc type winding machine and an ocean heave compensation system.The magnetic suspension disc type winding machine comprises a shell and a roller, and the roller is arranged in a cavity of the shell; a fan-shaped permanent magnet group and an annular permanent magnet group are arranged at the end part of the roller; a fan-shaped winding for providing a magnetic field for the fan-shaped permanent magnet group and an annular winding for providing a magnetic field for the annular permanent magnet group are arranged on the shell; a supporting piece is arranged at the bottom of the shell and can provide supporting force for the roller in the power-off state. The windings and the permanent magnet sets are used for replacing traditional complex hydraulic components such as hydraulic cylinders and energy accumulators. The system structure is simplified, the response is faster, the control is more accurate, and the energy consumption is lower.

Description

Technical Field

[0001] This invention relates to the field of marine heave compensation technology, specifically to a magnetic levitation disc winding machine and a marine heave compensation system. Background Technology

[0002] In floating drilling operations, the platform constantly rises and falls due to the effects of wind, waves, and currents. Without compensation, this motion is directly transmitted to the drill pipe, leading to uncontrollable drilling pressure. The drill bit may sometimes leave the wellbore or violently impact it, failing to effectively break the rock. This can damage equipment and the wellbore. The drill pipe, drill bit, and wellhead assembly will be subjected to alternating stress, making them prone to fatigue fracture and potentially damaging the drilled wellbore. Figure 1 As shown, the current equipment operates as follows: When the platform rises, it drives the overhead crane upwards, attempting to pull the hook upwards. However, due to the downward weight of the drill pipe, the hook tends to remain stationary. This causes the compensation cylinder to be compressed, and the hydraulic oil inside is forced into the accumulator, further compressing the nitrogen gas within and absorbing the platform's upward kinetic energy. When the platform descends, it drives the overhead crane downwards, reducing the pulling force on the hook. At this time, the compressed nitrogen gas in the accumulator expands, pushing the hydraulic oil back into the compensation cylinder, causing the piston rod of the compensation cylinder to extend, thereby holding the hook in place and preventing it from falling along with the platform as it descends.

[0003] The currently used overhead crane heave compensation platform has the following problems: 1. The overhead crane compensation device requires high strength from the derrick. This is because the compensation device is directly installed on the overhead crane, and its action and reaction forces act directly on the derrick structure. 2. The selected hydraulic system, especially the cylinder seals, is prone to hydraulic oil leakage. This is a common failure point in hydraulic systems, affecting system pressure and stability. 3. The gear-rack transmission mechanism used in the heave compensation device generates vibration excitation during meshing. Long-term operation may lead to wear and fatigue, affecting transmission accuracy and lifespan. 4. High energy consumption. Improper handling of the overall energy recovery and release efficiency can not only cause energy waste but may also cause a chain reaction of problems such as system oil overheating. Summary of the Invention

[0004] One objective of this invention is to provide a magnetic levitation disc winding machine that solves the problem of high failure rate in current hydraulic systems.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: A magnetic levitation disc winding machine includes a housing and a roller, the roller being placed in a cavity of the housing; the ends of the roller are provided with a fan-shaped permanent magnet group and an annular permanent magnet group, the housing is provided with a fan-shaped winding that provides a magnetic field for the fan-shaped permanent magnet group and an annular winding that provides a magnetic field for the annular permanent magnet group; a support member is provided at the bottom of the housing, the support member being able to provide support force for the roller in the power-off state.

[0006] Furthermore, a fan-shaped permanent magnet group is provided on the bottom wall of both ends of the roller, and an annular permanent magnet group is provided on the side wall of both ends of the roller.

[0007] Furthermore, the housing includes a first housing and a second housing, both of which have cavities for forming the cavity. The inner wall of the cavity is provided with an annular groove for placing an annular winding, and the end face of the cavity is provided with a sector groove for placing a sector winding.

[0008] Furthermore, the sector-shaped permanent magnet group includes three pairs of sector-shaped permanent magnets, each pair of sector-shaped permanent magnets including a sector-shaped N-pole permanent magnet and a sector-shaped S-pole permanent magnet; the sector-shaped permanent magnet group is formed by the sector-shaped N-pole permanent magnets and sector-shaped S-pole permanent magnets being arranged at intervals along the circumference of the roller.

[0009] Furthermore, the annular permanent magnet assembly includes two pairs of annular permanent magnets, each pair of annular permanent magnets including annular N-pole permanent magnets and annular S-pole permanent magnets; the annular permanent magnet assembly is formed by the annular N-pole permanent magnets and annular S-pole permanent magnets being arranged at intervals along the circumference of the roller.

[0010] Furthermore, the drum includes a rope winding section, which is disposed between the two ends of the drum, and the diameter of the rope winding section is smaller than the diameter of the ends; a steel wire rope is wound on the rope winding section, one end of the steel wire rope extends out from a slot at the bottom of the housing, and a tension sensor for measuring the tension of the steel wire rope is connected to the steel wire rope.

[0011] Furthermore, both the first and second housings are provided with a number of fins for heat dissipation, and both the first and second housings are provided with mounting holes, which are located between two adjacent fins; bolts pass through the mounting holes on the first housing and the second housing in sequence to connect the first housing and the second housing.

[0012] Furthermore, the support member includes a support block, a spring, and a spring sheet, with the spring sheet connected to the support block via the spring. In the energized state, the spring is in a contracted state under the magnetic force generated by the built-in winding of the support member; in the de-energized state, the spring provides support force to the roller under its own elastic force.

[0013] Furthermore, the top of the spring is provided with an arc-shaped groove that is adapted to the rope winding part.

[0014] Another objective of this invention is to provide a marine heave compensation system that solves the problem of fatigue wear of components such as gears and racks used in current marine heave compensation systems.

[0015] To achieve the above objectives, the technical solution adopted by this invention is as follows: A marine heave compensation system includes a magnetic levitation disc winder as described in the above embodiments, a control system, and a built-in encoder. The magnetic levitation disc winder is connected to a floating platform, a tension sensor is connected to the control system, and the control system is connected to the built-in encoder via a vector frequency converter. The built-in encoder can change the magnitude of the magnetic field that drives the drum to rotate.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This invention adopts a magnetic levitation disc structure design: combining the advantages of magnetic levitation technology and disc winding machines, it achieves contactless transmission and eliminates mechanical wear. The roller has multi-degree-of-freedom motion capabilities, enabling precise control.

[0017] 2. This invention replaces traditional hydraulic cylinders, accumulators, and other complex hydraulic components with windings and permanent magnets. This simplifies the system structure, resulting in faster response, more precise control, and lower energy consumption.

[0018] 3. The control system can automatically switch parameters according to real-time working conditions, enabling intelligent switching between various operating modes such as heave compensation, automatic drill feeding, and conventional tripping in and out. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an existing ocean heave compensation system.

[0020] Figure 2 This is a schematic diagram of a magnetic levitation disc winding machine.

[0021] Figure 3 This is a schematic diagram of the winding and the permanent magnet.

[0022] Figure 4 This is a schematic diagram of a roller.

[0023] Figure 5 This is a schematic diagram of the casing.

[0024] Figure 6 A flowchart of an ocean heave compensation system. Detailed Implementation

[0025] Example 1 like Figure 2As shown, a magnetic levitation disc winding machine includes a housing 1 and a roller 2, with the roller 2 placed in a cavity within the housing 1. The roller 2 has a sector-shaped permanent magnet group 3 and a ring-shaped permanent magnet group 4 at its ends. The housing 1 has a sector-shaped winding 5 providing a magnetic field to the sector-shaped permanent magnet group 3 and a ring-shaped winding 6 providing a magnetic field to the ring-shaped permanent magnet group 4. A support member is provided at the bottom of the housing 1, which provides support to the roller 2 in the absence of power. When energized, the sector-shaped winding 5 provides a magnetic field to the sector-shaped permanent magnet group 3, which in turn applies a force to the roller 2 in the left-right direction. The ring-shaped winding 6 provides a magnetic field to the ring-shaped permanent magnet group 4, which in turn applies a force to the roller 2 in the up-down and back-forward directions. This allows the roller 2 to levitate and rotate within the housing 1 without contact with other components. Because the roller 2 levitates within the housing 1, it does not contact other parts, effectively extending the equipment's lifespan and avoiding wear and fatigue problems caused by conventional mechanical transmission.

[0026] like Figure 3 and Figure 4 As shown, both ends of the roller 2 are provided with sector-shaped permanent magnet groups 3. The sector-shaped permanent magnet groups 3 are located on the bottom wall of the end of the roller 2. After the sector-shaped winding 5 is energized, it provides a magnetic field to the sector-shaped permanent magnet groups 3 at the corresponding positions. The sector-shaped permanent magnet groups 3 will make the roller 2 be placed in the middle position in the left-right direction of the housing 1.

[0027] Both ends of the drum 2 are equipped with annular permanent magnet groups 4. When the annular winding 6 is energized, it provides a magnetic field to the corresponding annular permanent magnet groups 4. The annular permanent magnet groups 4 will position the drum 2 in the middle of the front-to-back and up-down directions of the housing 1. Under the action of magnetic force, the drum 2 will be suspended in the cavity of the housing 1 and will not come into contact with other parts, realizing contactless operation and extending the service life of the equipment.

[0028] like Figure 5 As shown, the housing 1 includes a first housing 11 and a second housing 12. Both the first housing 11 and the second housing 12 have cavities for forming the cavity. The inner wall of the cavity is provided with an annular groove 7 for placing an annular winding, and the end face of the cavity is provided with a sector groove 8 for placing a sector winding. The sector permanent magnet group 3 includes three pairs of sector permanent magnets, each pair of sector permanent magnets including a sector N-pole permanent magnet and a sector S-pole permanent magnet; the sector permanent magnet group 3 is formed by sector N-pole permanent magnets and sector S-pole permanent magnets arranged at intervals along the circumference of the roller 2. The annular permanent magnet group 4 includes two pairs of annular permanent magnets, each pair of annular permanent magnets including an annular N-pole permanent magnet and an annular S-pole permanent magnet; the annular permanent magnet group 4 is formed by annular N-pole permanent magnets and annular S-pole permanent magnets arranged at intervals along the circumference of the roller 2.

[0029] The drum 2 includes a rope winding section disposed between two ends of the drum 2, and the diameter of the rope winding section is smaller than the diameter of the ends. A steel wire rope 35 is wound around the rope winding section, with one end of the steel wire rope 35 extending from a slot at the bottom of the housing 1. A tension sensor for measuring the tension of the steel wire rope 35 is connected to the steel wire rope 35. The magnetic field generated by the sector-shaped permanent magnet drives the drum 2 to rotate, causing the steel wire rope 35 to either wind around or be released from the rope winding section.

[0030] Both the first housing 11 and the second housing 12 are provided with a plurality of fins 13 for heat dissipation. Both housings 11 and 12 are provided with mounting holes 14. Bolts pass through the mounting holes 14 on the first housing and the second housing in sequence to connect the first housing 11 and the second housing 12. A sealing gasket is provided between the first housing 11 and the second housing 12. Both housings 11 and 12 are provided with connection holes 15 for connecting to the floating platform 33. The fins 13 can effectively air-cool the temperature generated by the windings, increasing the heat dissipation area. If greater heat dissipation is required, water-cooling or oil-cooling pipes can be added, or a fan can be added to the back of the housing 1 for heat dissipation. If higher strength is required, reinforcing ribs can be added to the back of the housing 1.

[0031] The support component includes a support block 21, a spring, and a spring piece 22. The spring piece 22 is connected to the support block 21 via the spring. When energized, the spring is in a contracted state under the magnetic force generated by the built-in winding of the support component. The support base has a built-in winding; when energized, the winding generates a magnetic field. The winding and the permanent magnet section of the spring piece 22 are attracted by opposite poles, drawing the spring piece 22 back into the support base to avoid interference with the operation of the roller 2. When de-energized, the spring, under its own elastic force, causes the spring piece to provide support for the roller. The top of the spring piece 22 is provided with an arc-shaped groove adapted to the rope winding section. Since the winding built into the support base shares the same power source as the fan-shaped winding 5 and the annular winding 6, when the power is off, the winding built into the support base is also de-energized, the magnetic field of the winding built into the support base disappears, and the spring piece 22 pops out under the action of the spring to support the roller 2, completing a safe stop.

[0032] Example 2 like Figure 6 As shown, an ocean heave compensation system includes a magnetic levitation disc winder as described in Embodiment 1 above, a control system 31, and a built-in encoder 32. The magnetic levitation disc winder is connected to a floating platform 33. A tension sensor 34 is connected to the control system 31. The control system 31 is connected to the built-in encoder 32 via a vector frequency converter. The built-in encoder 32 can change the magnitude of the magnetic field that drives the drum 2 to rotate.

[0033] Tension sensor 34 outputs a real-time tension signal of wire rope 35 and converts this signal into a bottom hole drilling pressure signal, which is then sent to control system 31. The built-in encoder 32 on drum 2 collects the actual angular displacement or angular velocity signal of drum 2. Control system 31 calculates the collected hull heave, bottom hole drilling pressure, and winch drum 2 signals according to the set control algorithm and forms a feedback mechanism. Inverter bridge 36 converts the DC bus voltage into variable frequency and variable voltage three-phase AC power based on the pulse signal generated by SVPWM, thereby controlling the magnetic field strength and direction of each winding in real time, and thus controlling the position, rotation direction, and rotation speed of drum 2. It also raises or lowers the floating system and drill string in real time, completing the conventional drill string 37 raising and lowering operations, heave compensation operations, and automatic drill feeding operations. Furthermore, it adaptively switches and adjusts the control methods and parameters under different working conditions based on the real-time operating status signal of the winding machine.

[0034] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A magnetic levitation disc winding machine, characterized in that, The device includes a housing and a roller, with the roller placed in a cavity of the housing. The ends of the roller are provided with a fan-shaped permanent magnet group and an annular permanent magnet group. The housing is provided with a fan-shaped winding that provides a magnetic field for the fan-shaped permanent magnet group and an annular winding that provides a magnetic field for the annular permanent magnet group. A support member is provided at the bottom of the housing, which can provide support force for the roller in the event of a power outage.

2. The magnetic levitation disc winding machine according to claim 1, characterized in that, A fan-shaped permanent magnet group is provided on the bottom wall of both ends of the roller, and an annular permanent magnet group is provided on the side wall of both ends of the roller.

3. The magnetic levitation disc winding machine according to claim 1, characterized in that, The housing includes a first housing and a second housing, both of which have cavities for forming the cavity. The inner wall of the cavity is provided with an annular groove for placing an annular winding, and the end face of the cavity is provided with a sector groove for placing a sector winding.

4. A magnetic levitation disc winding machine according to claim 1, characterized in that, The sector-shaped permanent magnet group includes three pairs of sector-shaped permanent magnets, each pair of sector-shaped permanent magnets including a sector-shaped N-pole permanent magnet and a sector-shaped S-pole permanent magnet; the sector-shaped permanent magnet group is formed by the sector-shaped N-pole permanent magnets and sector-shaped S-pole permanent magnets arranged at intervals along the circumference of the roller.

5. A magnetic levitation disc winding machine according to claim 1, characterized in that, The annular permanent magnet group includes two pairs of annular permanent magnets, each pair of annular permanent magnets including an annular N-pole permanent magnet and an annular S-pole permanent magnet; the annular permanent magnet group is formed by the annular N-pole permanent magnet and the annular S-pole permanent magnet being arranged at intervals along the circumference of the roller.

6. A magnetic levitation disc winding machine according to claim 1, characterized in that, The drum includes a rope winding section, which is located between the two ends of the drum, and the diameter of the rope winding section is smaller than the diameter of the ends; the rope winding section is wound with a steel wire rope, one end of which extends out from a slot at the bottom of the housing, and a tension sensor for measuring the tension of the steel wire rope is connected to the steel wire rope.

7. A magnetic levitation disc winding machine according to claim 1, characterized in that, Both the first and second housings are provided with a number of fins for heat dissipation. Both the first and second housings are provided with mounting holes, which are located between two adjacent fins. Bolts pass through the mounting holes on the first housing and the second housing in sequence to connect the first housing and the second housing.

8. A magnetic levitation disc winding machine according to claim 6, characterized in that, The support component includes a support block, a spring, and a spring sheet. The spring sheet is connected to the support block via the spring. When energized, the spring is in a contracted state under the magnetic force generated by the built-in winding of the support component. When de-energized, the spring provides support force to the roller under its own elastic force.

9. A magnetic levitation disc winding machine according to claim 8, characterized in that, The top of the spring is provided with an arc-shaped groove that matches the rope winding part.

10. A marine heave compensation system, characterized in that, The device includes a magnetic levitation disc winding machine as described in any one of claims 1 to 9, a control system, and a built-in encoder. The magnetic levitation disc winding machine is connected to a floating platform, the tension sensor is connected to the control system, and the control system is connected to the built-in encoder via a vector frequency converter. The built-in encoder can change the magnitude of the magnetic field that drives the drum to rotate.

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