A displacement sensing system for a flexible connection structure of multiple floating bodies at sea

Abstract

The present invention discloses a displacement sensing system for a flexible connection structure of multiple floating bodies at sea. The system is connected between two adjacent floating bodies at sea and comprises two Hall displacement sensors of identical structure and a cable connected between the two Hall displacement sensors. The central axis inside the housing of the cable magnet variable device is connected to a permanent magnet disk via a bearing at one end close to the housing of a signal analysis device. The permanent magnet disk has a plurality of permanent magnets evenly arranged along the circumferential direction on the disk surface facing the housing of the signal analysis device. One end of a hollow rotating shaft is fixedly connected to the disk surface facing away from the signal analysis device. A self-winding spring is tightly sheathed inside the hollow rotating shaft and is sheathed outside the central axis with a gap. The two ends of the cable are respectively wound around the outer ring of the hollow rotating shaft of a Hall displacement sensor. The Hall disk inside the housing of the signal analysis device has a Hall chip array fixedly affixed to the disk surface facing the permanent magnet disk. The Hall encoder converts the electrical signal measured by the Hall chip array into a displacement signal and records it.

Description

Technical Field

[0001] The present invention relates to the field of displacement sensing technology, and in particular to a Hall effect displacement sensing system for a flexible connection structure of multiple floating bodies at sea, which is used to monitor and record the relative displacement between the floating bodies at sea. Background Art

[0002] In recent years, due to land resource constraints restricting the large-scale development of onshore photovoltaic systems, floating offshore photovoltaic systems have attracted widespread attention and rapidly entered the research and development testing phase. Multi-floating structures are a major future development direction for offshore photovoltaic systems. The flexible connections between the floats in a multi-floating structure are key components. Therefore, monitoring collision damage to the floats and fatigue damage to the flexible connections between the floats is crucial during the development phase of floating photovoltaic systems. Therefore, using appropriate sensors to automatically monitor and record relative displacement data between the floats is crucial for optimizing the float structure and flexible connections during the development phase.

[0003] Currently, the status of floating structures at sea is monitored manually or with wire-type displacement sensors. However, long-term manual monitoring of collision damage and fatigue damage is difficult and costly. Wire-type displacement sensors have complex mechanical structures, high friction power consumption, and poor water resistance. When used in seawater, they are susceptible to electrical failures caused by the humid and corrosive marine environment. Therefore, a displacement sensing system is needed that is less susceptible to the humid and corrosive marine environment, has low power consumption, a long service life, and can automatically monitor for extended periods without human intervention. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to propose a displacement sensing system for a flexible connection structure of multiple floating bodies at sea, which is less affected by the humid and corrosive environment of the ocean, has low power consumption, a long service life, and can automatically monitor the relative displacement between floating bodies at sea for a long time without human intervention.

[0005] To achieve the above-mentioned purpose, the present invention adopts a technical solution for a displacement sensing system of a flexible connection structure of multiple floating bodies at sea: it is connected between two adjacent floating bodies at sea, and is composed of two Hall displacement sensors with the same structure and a pull wire connected between the two Hall displacement sensors, and one Hall displacement sensor is fixedly connected to one floating body at sea; each of the Hall displacement sensors has a fixedly connected pull wire magnetic variable device housing and a signal analysis device housing, and the pull wire magnetic variable device housing is provided with a central axis, a self-winding spring, a hollow rotating shaft, a permanent magnet disk and a permanent magnet inside the pull wire magnetic variable device housing, the two ends of the central axis are fixedly and sealedly connected to the side of the pull wire magnetic variable device housing, the central axis is connected to the permanent magnet disk at one end close to the signal analysis device housing through a rotating bearing, and the permanent magnet disk is evenly arranged with several permanent magnets along the circumferential direction on the disk surface facing the signal analysis device housing. The invention relates to a body, wherein all permanent magnets are magnetized along the axial direction of the permanent magnet disk and the magnetization direction is the same; the permanent magnet disk is fixedly connected to one end of a hollow rotating shaft on the disk surface facing away from the outer shell of the wire-drawing magnetic variable device; a self-winding spring is tightly sheathed inside the hollow rotating shaft, and the self-winding spring is sheathed outside the central shaft with a gap; the two ends of the wire are respectively wound around the outer ring of the hollow rotating shaft of a Hall displacement sensor; the signal analysis device shell is internally provided with a Hall disk, a Hall chip array and a Hall encoder; the Hall disk is fixed and its axis is collinear with the axis of the permanent magnet disk; the Hall disk is fixed with a Hall chip array on the disk surface facing the permanent magnet disk; the Hall disk is made of a conductive material, and a stable current is provided inside the Hall chip array; the Hall chip array monitors the change of magnetic flux and converts it into an electrical signal; the Hall encoder converts the electrical signal measured by the Hall chip array into a displacement signal and records it.

[0006] The beneficial effects of the present invention after adopting the above technical solution are:

[0007] 1. The present invention uses the Hall effect as the displacement monitoring principle, which greatly reduces friction power consumption. Compared with the traditional wire displacement sensor, it effectively reduces friction power consumption and increases service life. At the same time, the monitoring process does not require human intervention and can automatically detect for a long time.

[0008] 2. The present invention adopts a fully sealed signal analysis device, and its internal signal analysis structure all adopts Hall elements, which is less affected by the external environment, greatly improving the service life of the sensor in a humid marine environment. The sealed structure can effectively reduce the damage caused by the marine environment and loads such as wind, waves and currents.

[0009] 3. The sensor system of the present invention has a simple structure and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0011] Figure 1This is a schematic diagram of the overall structure of a displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to the present invention;

[0012] Figure 2 for Figure 1 The schematic diagram of the installation state of the displacement sensing system shown is between floating bodies at sea;

[0013] Figure 3 for Figure 1 Schematic diagram of the overall structure of a single Hall displacement sensor;

[0014] Figure 4 for Figure 3 Schematic diagram of the appearance of the wire-drawing magnetic variable device;

[0015] Figure 5 for Figure 4 A cross-sectional view of the internal structure of the wire-drawing magnetic variable device;

[0016] Figure 6 for Figure 4 The internal structure and appearance of the wire-drawing magnetic variable device;

[0017] Figure 7 for Figure 6 Schematic diagram of the decomposition of the middle part structure;

[0018] Figure 8 for Figure 6 An enlarged view of the structure after removing the outer shell of the wire-drawing magnetic variable device;

[0019] Figure 9 for Figure 8 Axonometric view of the posterior aspect;

[0020] Figure 10 for Figure 2 Schematic diagram of the internal structure of the signal analysis device housing;

[0021] Figure 11 for Figure 10 An enlarged view of the structure after removing the outer shell of the signal analysis device;

[0022] Figure 12 for Figure 3 Schematic diagram of the internal structure;

[0023] Figure 13 This is a schematic diagram of the Hall effect principle;

[0024] Figure 14 This is a schematic diagram of the present invention utilizing the Hall effect principle;

[0025] Figure 15 This is a schematic diagram of the structure of the present invention using the Hall effect to monitor displacement.

[0026] In the figure: 1-wire magneto-variable device housing; 2-wire inlet and outlet hole; 3-sealing knob; 4-center axis; 5-self-winding spring; 6-hollow rotating shaft; 7-rotating bearing; 8-permanent magnet disk; 9-permanent magnet; 10-wire; 11-signal analysis device housing; 12-Hall disk; 13-Hall chip array; 14-Hall encoder; 15-fixed short shaft; 16-Hall displacement sensor; 17-offshore floating body. DETAILED DESCRIPTION

[0027] See Figure 1 The present invention is composed of two Hall displacement sensors 16 and a pull wire 10. The structures of the two Hall displacement sensors 16 are exactly the same. The two Hall displacement sensors 16 are connected by the pull wire 10 to form a whole.

[0028] See Figure 2 The present invention is installed between two adjacent offshore buoys 17. A Hall effect sensor 16 is fixedly connected to each buoy 17. The Hall effect sensor 16 is fixed to the side of the buoy 17. The two Hall effect sensors 16 are positioned on the two buoys 17 to minimize the length of the cable 10 between the two Hall effect sensors 16. The two Hall effect sensors 16 monitor the relative displacement between the two buoys 17. Simultaneous monitoring by the two Hall effect sensors 16 improves data accuracy.

[0029] See Figure 3 Each Hall displacement sensor 16 consists of a wire-type magnetic variable device and a signal analysis device. The wire-type magnetic variable device is enclosed by a wire-type magnetic variable device housing 1, while the signal analysis device is enclosed by a signal analysis device housing 11. The wire-type magnetic variable device housing 1 and the signal analysis device housing 11 are fixedly connected. The wire-type magnetic variable device housing 1 is a cube, while the signal analysis device housing 11 is a fully sealed cylindrical structure that provides maximum protection for the internal signal analysis components. One side surface of the wire-type magnetic variable device housing 1 is integrally fixed to one end surface of the signal analysis device housing 11.

[0030] Combine Figure 4 The side of the cable magnet device housing 1 is provided with a through cable entry and exit hole 2 for the extension and retraction of the cable 10. Figure 1 The pull wire 10 extends from the pull wire inlet and outlet hole 2 into the interior of the pull wire magnetic variable device housing 1.

[0031] See Figure 5-6The interior of the cable-pulling magnetic variable device housing 1 is equipped with a central shaft 4, a self-winding spring 5, a hollow rotating shaft 6, a permanent magnet disk 8, and a permanent magnet 9. The central shaft 4 is collinear with the central axis of the signal analysis device housing 11, and its ends are fixedly and sealedly connected to the side surfaces of the cable-pulling magnetic variable device housing 1. The axis of the central shaft 4 is perpendicular to the centerline of the cable-pulling inlet and outlet hole 2, so that the diameter of the central shaft 4 is the direction of the cable 10's extension and retraction. To maximize the torsional torque it can withstand, the central shaft 4 is designed to be hollow.

[0032] The central shaft 4 is connected to a permanent magnet disk 8 at one end near the signal analysis device housing 11 through a rotating bearing 7. The permanent magnet disk 8 is a homogeneous disk. The extension and contraction direction of the pull wire 10 is also the diameter direction of the permanent magnet disk 8. The permanent magnet 9 is fixedly set on the disk surface of the permanent magnet disk 8 facing the signal analysis device housing 11. The permanent magnet disk 8 is fixedly connected to one end of the hollow rotating shaft 6 on the other side, that is, the disk surface facing away. The hollow rotating shaft 6 is internally sleeved with a self-winding spring 5, which is sleeved on the outside of the central shaft 4. The inner wall of the hollow rotating shaft 6 is in close contact with the self-winding spring 5, and the self-winding spring 5 is sleeved on the outside of the central shaft 4 with a gap. The pull wire 10 extending from the pull wire inlet and outlet hole 2 is wound around the outer ring of the hollow rotating shaft 6. The extension and contraction of the pull wire 10 can drive the hollow rotating shaft 6 to rotate.

[0033] The central shaft 4 is coaxially fixedly connected to a sealing knob 3 at the end away from the signal analysis device housing 11. The sealing knob 3 is sealed to the side of the wire-pull magnetic variable device housing 1 to ensure that there is no relative displacement or relative rotation between the central shaft 4 and the wire-pull magnetic variable device housing 1.

[0034] Because the hollow shaft 6 is fixedly connected to the permanent magnet disk 8 at the end closest to the signal analysis device housing 11, when the hollow shaft 6 rotates, the permanent magnet disk 8 rotates synchronously with it. This rotation of the permanent magnet disk 8 drives the permanent magnet 9 to rotate, thereby generating a change in the magnetic field. Because a rotating bearing 7 is connected between the permanent magnet disk 8 and the central shaft 4, the central shaft 4 remains stationary during the rotation of the permanent magnet disk 8. The rotating bearing 7 reduces friction between the permanent magnet disk 8 and the central shaft 4 as the hollow shaft 6 rotates, while also offsetting axial displacement between the hollow shaft 6 and the permanent magnet disk 8 during rotation.

[0035] The axis lines of the central shaft 4, the self-winding spring 5, the hollow rotating shaft 6 and the permanent magnet disk 8 are collinear.

[0036] See Figure 7-Figure 8The self-winding spring 5 is sleeved on the outside of the central shaft 4, and its end 5-A near the sealing knob 3 is fixed to the end of the central shaft 4 near the sealing knob 3, and its other end 5-B near the permanent magnet disk 8 is fixedly connected to the inner wall of the rotating shaft 6. When the hollow rotating shaft 6 and the central shaft 4 do not rotate relative to each other, the self-winding spring 5 is in an initial relaxed state. At this time, the self-winding spring 5 does not generate a torsional spring force. When the hollow rotating shaft 6 is driven by the tension of the pull wire 10 and rotates relative to the central shaft 4, the self-winding spring 5 contracts accordingly and stores spring force. When the tension of the pull wire 10 disappears, the self-winding spring 5 drives the hollow rotating shaft 6 to rotate in the opposite direction under the action of the spring force, so that the hollow rotating shaft 6 is reset and returns to its initial state.

[0037] The permanent magnet disc 8 is a thin disc, and its axial length is much smaller than that of the hollow shaft 6. It is fixedly mounted on the outer ring of the rotating bearing 7. The inner ring of the rotating bearing 7 is fixedly mounted on the end of the central shaft 4 close to the signal analysis device housing 11.

[0038] See Figure 9 Several permanent magnets 9 are fixedly attached to the surface of the permanent magnet disk 8 facing the signal analysis device housing 11. Each permanent magnet 9 protrudes from the disk surface and is in the shape of a sector ring, with the center of rotational symmetry about the axis of the permanent magnet disk 8. The permanent magnets 9 are evenly spaced along the circumference of the disk surface. The permanent magnets 9 are arranged in at least two layers along the diameter, with the permanent magnets 9 in each layer evenly spaced along the circumference of the disk surface. All permanent magnets 9 have equal magnetic properties, are magnetized axially along the permanent magnet disk 8, and have the same magnetization direction. When the permanent magnet disk 8 rotates about the central axis 4, the permanent magnets 9 thereon rotate with it. Because the permanent magnets 9 are evenly spaced, the rotation of the permanent magnet disk 8 causes regular changes in the magnetic flux in the surrounding space.

[0039] See Figure 10 Inside the signal analysis device housing 11, a Hall disk 12, a Hall chip array 13, a Hall encoder 14, and a fixed short shaft 15 are provided. The Hall disk 12 is a fixed, homogeneous disk that is sleeved on the fixed short shaft 15 and faces the permanent magnet disk 8. The axis of the Hall disk 12 is collinear with the axis of the permanent magnet disk 8. The fixed short shaft 15 is fixedly connected to the signal analysis device housing 11 at the end close to the permanent magnet disk 8, and is fixedly connected to the signal analysis device housing 11 at the end away from the permanent magnet disk 8 through the Hall encoder 14. The outer edge of the Hall disk 12 is fixedly connected to the inner wall of the signal analysis device housing 11, and the Hall disk 12 is fixed inside the signal analysis device housing 11 with the help of the fixed short shaft 15.

[0040] A Hall effect chip array 13 is fixed to the surface of the Hall effect disk 12 facing the permanent magnet disk 8. This array measures the changes in magnetic flux generated by the rotation of the permanent magnet disk 8 in the wire-type magnetostrictive device. Hall effect disk 12 is made of a conductive material and internally provides a stable current through the Hall effect chip array 13.

[0041] The Hall chip array 13 is electrically connected to the Hall encoder 14. The magnetic flux change signal monitored by the Hall chip array 13 is input into the Hall encoder 14. The Hall encoder 14 converts the magnetic flux change signal monitored by the Hall chip array 13 into a displacement signal. This process does not require human intervention and can achieve long-term automatic monitoring. There is no friction in the signal analysis device during operation, which can effectively reduce power consumption and greatly extend the service life of the Hall displacement sensor 16.

[0042] See Figure 11 The Hall disk 12 is perpendicular to the axis of the Hall disk 12 in the middle of the disk surface facing the permanent magnet disk 8. There is an angle between the axis of the Hall disk 12 and the periphery of the disk surface. A circle of Hall chip arrays 13 are evenly distributed along the circumferential direction in the middle position of the disk surface, and a circle of Hall chip arrays 13 are also evenly distributed along the circumferential direction around the disk surface. Such a Hall chip array 13 can improve the accuracy of measuring magnetic flux changes.

[0043] Therefore, all signal analysis devices use Hall elements, and use the Hall effect to convert the displacement signal in the wire magnetic variable device into an electromagnetic signal, which is then converted back into a displacement signal and recorded through a signal analysis device.

[0044] See Figure 12 and combined Figure 2 When the Hall displacement sensor 16 is working, the wire 10 in the wire magnetic variable device expands and contracts as the displacement of the monitored offshore floating body 17 changes, thereby driving the permanent magnet disk 8 to rotate, causing the magnetic flux in the nearby space to change. At this time, the Hall chip array 13 in the signal analysis device detects this magnetic flux change, and the Hall encoder 14 converts the magnetic flux change signal monitored by the Hall array 13 into a displacement signal.

[0045] The Hall effect sensor 16 works on the principle of Hall effect. Figure 13 , place a Hall element in a magnetic field. When a current i flows through the Hall element in a certain direction, an electromotive force V will be generated inside the Hall element in a direction perpendicular to the current and magnetic field. H When the current through the Hall element remains unchanged, changing the magnetic flux through the Hall element (i.e., magnetic field change) will cause the electromotive force V at both ends of the Hall element to change. H By analyzing the electromotive force V H The change in can be derived from the change in magnetic flux (magnetic field).

[0046] See Figure 14 , the present invention utilizes Figure 13 In the Hall principle shown in FIG. 1 , a Hall chip 13 is placed opposite a permanent magnet disk 8. Permanent magnets 9 evenly distributed in a ring shape on the permanent magnet disk 8 provide a magnetic field passing through the Hall chip 13. The current passing through the Hall chip array 13 is kept constant. When the pull wire 10 drives the permanent magnet disk 8 to rotate, the several permanent magnets 9 on it rotate accordingly, causing the magnetic flux (i.e., magnetic field) passing through the Hall chip 13 to change, and ultimately causing the electromotive force inside the Hall chip array 13 to change. In this process, the Hall chip array 13 converts the displacement signal into an electrical signal.

[0047] See Figure 15 The permanent magnet disk 8 in the wire-type magnetic variable device and the axis of the Hall disk 12 in the signal analysis device are collinear. Therefore, the Hall chip array 13 in the middle of the Hall disk 12 is parallel to the permanent magnet 9, while the Hall chip arrays 13 around the Hall disk 12 are at a certain angle to the permanent magnet 9. This is to increase the accuracy of monitoring magnetic field changes.

[0048] A constant current is provided inside the Hall disk 12 through the Hall chip array 13. When the pull wire 10 in the magnetic variable device drives the permanent magnet disk 8 to rotate, the permanent magnets 9 on it are evenly distributed in a ring shape, and the magnetic flux (magnetic field) passing through the Hall chip array 13 will change, resulting in a corresponding change in the electromotive force in the Hall chip array 13. The Hall encoder 14 converts the electromotive force change generated in the Hall chip array 13 into a displacement signal and records it.

[0049] The present invention utilizes a wire-type magnetic variable device to convert a displacement change signal into a magnetic field change signal. Based on the Hall effect principle, the magnetic field change signal is then converted into an electromotive force change signal. Finally, a signal analysis device is used to reconvert the electromotive force change signal back into a displacement change signal and record it, thereby achieving long-term, low-power, autonomous detection. During operation, the present invention first affixes two Hall displacement sensors 16 to the sides of two adjacent offshore buoys 17 to be monitored. The two Hall displacement sensors 16 share a common wire 10, the ends of which are connected to hollow shafts 6 in the two wire-type magnetic variable devices. When the two offshore buoys 17 approach each other, the wire 10 contracts. When the two offshore buoys 17 move away from each other, the wire 10 extends. Consequently, the contraction and retraction of the wire 10 rotates the permanent magnet disk 8 in the wire-type magnetic variable device, causing the magnetic field in the surrounding space to change. When the wire 10 extends, it pulls the hollow shaft 6 at both ends to rotate, causing the permanent magnet disk 8 with the permanent magnet 9 to rotate accordingly, providing a magnetic flux change to the signal analysis device, and at this time, the self-winding spring 5 is stretched. When two offshore buoys 17 approach each other, the stretched self-winding spring 5 contracts, driving the hollow shaft 6 to rotate in the opposite direction, and the cable 10 is retracted, which also provides a magnetic flux change to the signal analysis device. Based on the Hall effect principle, the signal analysis device converts the magnetic field change signal into an electromotive force change signal. Finally, the Hall effect encoder 14 analyzes the electromotive force change signal and converts it back into a displacement signal, which is recorded. This enables long-term, low-power, automatic displacement monitoring in humid marine environments.

Claims

1. A displacement sensing system for a flexible connection structure of multiple floating bodies at sea, characterized by: It is connected between two adjacent offshore buoys (17) and consists of two Hall displacement sensors (16) with the same structure and a pull wire (10) connected between the two Hall displacement sensors (16). One Hall displacement sensor (16) is fixedly connected to one offshore buoy (17). Each Hall displacement sensor (16) comprises a wire-drawing magnetic variable device housing (1) and a signal analysis device housing (11) which are fixedly connected. A central shaft (4), a self-winding spring (5), a hollow rotating shaft (6), a permanent magnet disk (8) and a permanent magnet (9) are provided inside the wire-drawing magnetic variable device housing (1). Both ends of the central shaft (4) are fixedly and sealedly connected to the side of the wire-drawing magnetic variable device housing (1). The central shaft (4) is connected to the permanent magnet disk (8) at one end close to the signal analysis device housing (11) through a rotating bearing (7). The permanent magnet disk (8) is disposed on the side of the wire-drawing magnetic variable device housing (11). A plurality of permanent magnets (9) are evenly arranged along the circumferential direction on the disk surface of the signal analysis device housing (11), and all the permanent magnets (9) are magnetized along the axial direction of the permanent magnet disk (8) and in the same magnetization direction. The permanent magnet disk (8) is fixedly connected to one end of a hollow rotating shaft (6) on the disk surface facing away from the pull-wire magnetic variable device housing (11), and a self-winding spring (5) is tightly sheathed inside the hollow rotating shaft (6), and the self-winding spring (5) is sheathed outside the central shaft (4) with a gap; the two ends of the pull wire (10) are respectively wound around the outer ring of the hollow rotating shaft (6) of a Hall displacement sensor (16); The signal analysis device housing (11) is provided with a Hall disk (12), a Hall chip array (13) and a Hall encoder (14). The Hall disk (12) is fixed and its axis is collinear with the axis of the permanent magnet disk (8). The Hall chip array (13) is fixedly attached to the disk surface of the Hall disk (12) facing the permanent magnet disk (8). The Hall disk (12) is made of a conductive material and provides a stable current passing through the Hall chip array (13). The Hall chip array (13) monitors the change of magnetic flux and converts it into an electrical signal. The Hall encoder (14) converts the electrical signal measured by the Hall chip array (13) into a displacement signal and records it.

2. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 1 is characterized by: A through-hole (2) for pulling wires is provided on the side of the casing (1) of the pulling wire magnetic variable device. The pulling wire (10) extends into the interior of the casing (1) of the pulling wire magnetic variable device from the pulling wire entrance and exit hole (2). The axis of the central axis (4) is perpendicular to the center line of the pulling wire entrance and exit hole (2).

3. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 1 is characterized by: The central shaft (4) is a hollow structure, and the axis lines of the central shaft 4, the self-winding spring 5, the hollow rotating shaft 6, and the permanent magnet disk 8 are collinear.

4. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 1 is characterized by: One end of the self-winding spring (5) close to the sealing knob (3) is fixedly connected to the central shaft (4), and the other end is fixedly connected to the inner wall of the rotating shaft (6). When the hollow rotating shaft (6) and the central shaft (4) do not rotate relative to each other, the self-winding spring (5) is in an initial state.

5. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 1 is characterized by: A plurality of permanent magnets (9) protrude from the disk surface of the permanent magnet disk (8), each permanent magnet (9) is in the shape of a sector ring, the rotational symmetry center of the sector ring is on the axis of the permanent magnet disk (8), and the plurality of permanent magnets (9) are evenly arranged along the circumferential direction of the disk surface.

6. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 5 is characterized by: A plurality of permanent magnets (9) are arranged in at least two layers along a diameter direction, and the permanent magnets (9) on each layer are evenly arranged along a circumferential direction of the disk surface.

7. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 1 is characterized by: The Hall disk (12) is perpendicular to the axis of the Hall disk (12) in the middle of the disk surface facing the permanent magnet disk (8), and an angle is formed between the disk surface and the axis of the Hall disk (12). A circle of Hall chip arrays (13) parallel to the permanent magnet (9) is evenly distributed in the middle of the disk surface along the circumferential direction, and a circle of Hall chip arrays (13) forming an angle with the permanent magnet (9) is evenly distributed in the circumferential direction around the disk surface.

8. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 1 is characterized by: The positions of the two Hall displacement sensors (16) on the two offshore floating bodies (17) make the length of the cable (10) between the two Hall displacement sensors (16) the shortest.

9. The displacement sensing system for a flexible connection structure of multiple floating bodies at sea according to claim 1 is characterized by: The central axis (4) is coaxially fixedly connected to a sealing knob (3) at one end away from the signal analysis device housing (11), and the sealing knob (3) is sealedly connected to the side of the cable magnet device housing (1).

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