A load self-balancing based floating dock electromagnetic floating and lifting system

Abstract

The application discloses a kind of floating dock electromagnetic floating lifting systems based on load self-balancing, including several electromagnetic floating lifting devices along the direction of ship body;The electromagnetic floating lifting device includes several electromagnetic coils, levitation electromagnet and controller;Levitation electromagnet is suspended above electromagnetic coil under the action of magnetic field force, and the top is provided with several load measuring instruments, and the lower portion is provided with gap ranging sensor;The controller is connected with gap ranging sensor, load measuring instrument and electromagnetic coil, and is connected with alarm device, and the controller is internally set to limit magnetic levitation force range and limit gap range, and the current size of electromagnetic coil is adjusted by comparing measured value and limit range;When measured value is too large or too small, controller instructs alarm device to issue alarm.The application can realize adaptive adjustment and control to lifting device, provide uniform and stable lifting force in each lifting device, and improve the safety of floating dock lifting operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a floating dock, in particular to a floating dock electromagnetic floating lifting system based on load self-balancing. BACKGROUND

[0002] The floating dock is a floating device for sea barge, which is an indispensable key hardware condition in the process of ship repairing and building. During the use, not only the safety of the lifted ship or offshore platform needs to be ensured, but also the safety of the floating dock and the supporting device needs to be ensured.

[0003] Due to the large size of the sea ship, in order to meet the demand of stopping the ship, the length of the floating dock needs to be designed to be large, which can reach several hundred meters, and the width is relatively small, about tens of meters. Due to the large length, the floating dock will inevitably be deformed in the middle arch and the middle vertical under the action of the wave. When the floating dock is deformed in the middle arch and the middle vertical, the relative distance between the floating dock and the ship or offshore platform presents a dynamic change trend. The traditional lifting device cannot adapt to the dynamic change of the supporting distance, and the local support is often excessive or insufficient, which causes the rapid change and uneven distribution of the supporting load, and thus causes the plastic deformation of the lifted ship, which brings danger to the safe offshore lifting operation of the floating dock. SUMMARY

[0004] The purpose of the present application is to provide a floating dock electromagnetic floating lifting system based on load self-balancing, which can ensure the uniform stress of the ship.

[0005] The floating dock electromagnetic floating lifting system based on load self-balancing comprises a plurality of electromagnetic floating lifting devices arranged along the ship body direction. The electromagnetic floating lifting device comprises a plurality of electromagnetic coils, a suspension electromagnet in contact with and lifting the ship body, and a controller. The electromagnetic coils are installed on the bottom of the floating dock through a supporting rail. The suspension electromagnet is suspended above the electromagnetic coil under the action of the magnetic field force generated by the electromagnetic coil, and the length direction of the suspension electromagnet is perpendicular to the ship body direction. A plurality of load measuring instruments are installed on the top of the suspension electromagnet, and a gap distance sensor for measuring the distance between the supporting rail and the suspension electromagnet is arranged below. The controller is connected with the gap distance sensor, the load measuring instrument and the electromagnetic coil, and is connected with an alarm device. The controller is internally provided with a limited magnetic floating force range and a limited gap range. The current of the electromagnetic coil is adjusted by comparing the measured values of the gap distance sensor and the load measuring instrument with the limited magnetic floating force range and the limited gap range. When the measured values are too large or too small to exceed the limited range, the controller instructs the alarm device to issue an alarm.

[0006] Preferably, when the distance between the supporting rail and the suspension electromagnet is small and the load is large, the current of the electromagnetic coil is reduced. When the distance between the supporting rail and the suspension electromagnet is large and the load is small, the current of the electromagnetic coil is increased.

[0007] Preferably, the controller calculates the average value of the measurement of each load measuring instrument, compares the average value with the limit magnetic levitation force range, and simultaneously controls the synchronous change of the current of each electromagnetic coil.

[0008] Preferably, the support rail is connected with the levitation electromagnet through a safety protection chain, and the safety protection chain limits the maximum displacement of the levitation electromagnet to the floating dock bottom.

[0009] Preferably, the electromagnetic levitation lifting devices are distributed with smaller spacing in the middle area of the ship and larger spacing in the two side areas.

[0010] Preferably, the electromagnetic coils are uniformly arranged along the length direction of the levitation electromagnet.

[0011] Preferably, the support rail is arranged in parallel to the ship body direction, corresponding to the levitation electromagnet one by one in up and down directions, and the length direction of the support rail is perpendicular to the ship body direction; the gap distance sensor is installed at the middle position of the support rail.

[0012] In particular, the support rail can also be arranged in perpendicular to the ship body direction, and the length direction of the support rail is parallel to the ship body direction; the middle support rail is provided with a plurality of gap distance sensors corresponding to the levitation electromagnet one by one.

[0013] Working principle: when the floating dock occurs middle arching and middle sagging deformation, the relative distance between the floating dock and the carried ship body or ocean platform presents a dynamic change trend, the magnetic levitation gap of the electromagnetic levitation lifting device and the support load to the ship body change, when the support rail and the levitation electromagnet have smaller spacing and larger load, the current of the electromagnetic coil is reduced to reduce the magnetic levitation force at this place; when the support rail and the levitation electromagnet have larger spacing and smaller load, the current of the electromagnetic coil is increased to increase the magnetic levitation force at this place; each electromagnetic levitation lifting device self-adapts the load balance, so that the whole lifting system is kept under uniform stress to provide stable lifting force.

[0014] Beneficial effects: compared with the prior art, the present application has the following remarkable advantages: 1. The self-adaptive adjustment and control of the lifting device can provide uniform and stable lifting force for each lifting device, avoid the fluctuation of the supporting force of the floating dock on the ship body under the action of waves, improve the safety of the floating dock lifting operation, greatly reduce the safety influence of the ship body deformation on the offshore lifting operation in waves, and reduce the sea condition limitation of the offshore operation of the floating dock; 2. The electromagnetic floating lifting device is used to replace the existing dock pier structure, which can increase the contact supporting area of the floating dock and the ship body, make the distribution of the lifting load more uniform and the amplitude fluctuation smaller, and avoid the direct contact between the floating dock and the lifted ship body, thereby providing more stable and continuous lifting supporting force; 3. The fixed electromagnetic floating track can reduce the preparation time of each lifting, improve the work efficiency of the lifting operation, simplify the preparation work of the offshore lifting operation, improve the use efficiency of the floating dock, save the waiting time of the rescued ship, and has remarkable economic and social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the present application;

[0016] Figure 2 is a structural schematic diagram of the electromagnetic lifting device of the present application;

[0017] Figure 3 is a schematic diagram of the floating dock in the middle vertical state under the action of waves;

[0018] Figure 4 is a schematic diagram of the floating dock in the middle arch state under the action of waves. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be further described below in combination with the drawings.

[0020] Example 1

[0021] As shown in Figure 1 , a floating dock electromagnetic floating lifting system based on load self-balancing is arranged on the dock bottom of the floating dock B and used for lifting the ship body A. The system includes a plurality of groups of electromagnetic floating lifting devices C arranged along the ship body direction, and the electromagnetic floating lifting device C is fixedly arranged on the floating dock bottom, as shown in Figure 2 , including an electromagnetic coil 1, a suspended electromagnet 2, a supporting track 3, an automatic controller 4, a load measuring instrument 5, a gap distance sensor 6, an alarm device 7 and a safety protection chain 8.

[0022] The arrangement of each group of electromagnetic floating lifting devices C is that the spacing in the middle area is small, and the spacing in the two side areas is large.

[0023] The support track 3 is laid on the bottom of the floating dock, arranged parallel to the hull and perpendicular to the hull in its length. Several electromagnetic coils 1 are evenly distributed on the support track 3, forming an electromagnetic floating track. A suspension electromagnet 2 is installed above the electromagnetic coils 1. The suspension electromagnet 2 is suspended above the electromagnetic floating track by the magnetic field generated by the electromagnetic coils 1, supporting the hull. Its length is perpendicular to the hull and corresponds to the support track 3 in the vertical direction. A safety chain 8 is connected between the suspension electromagnet 2 and the support track 3. Two safety chains 8 are mounted on the ends of the suspension electromagnet 2 and the support track 3, respectively, to limit the maximum displacement of the suspension electromagnet 2 relative to the support track 3, preventing the floating dock and the hull from separating.

[0024] Several load measuring instruments 5 are mounted on the support surface of the levitation electromagnet 2, which lifts the hull. A gap distance sensor 6 is installed in the middle of the support track 3. An automatic controller 4 is connected to each load measuring instrument 5, gap distance sensor 6, electromagnetic coil 1, and alarm device 7. Each load measuring instrument 5 measures the load supported by the electromagnetic levitation lifting device at that location and converts it into a signal that is transmitted to the automatic controller 4. The gap distance sensor 6 measures the distance between the support track 3 and the levitation electromagnet 2 at its installation point, namely the magnetic levitation gap, and converts it into a signal that is transmitted to the automatic controller 4. The automatic controller 4 receives the signals from each load measuring instrument 5 and gap distance sensor 6 and calculates the average of the measurement data from each load measuring instrument 5.

[0025] The automatic controller 4 presets a limited magnetic buoyancy range and a limited gap range. By comparing the measurement value of the gap distance sensor with the limited gap range, and comparing the average value measured by the load measuring instrument with the limited magnetic buoyancy range, instructions are issued to adjust the current of each electromagnetic coil 1 according to the amplitude of the difference and the change trend.

[0026] When the floating dock B lifts the ship in the waves, its shape shows a dynamic change trend under the action of the waves. The magnetic levitation gap of the electromagnetic floating lifting device C at different positions and the supporting load on the hull A will change: Figure 3 As shown in , when the floating dock B is in the sagging state, the magnetic levitation gap at the bow and stern is reduced, and the supporting load at this location is larger, while the magnetic levitation gap at the midship is increased, and the supporting load at this location is smaller; Figure 4 As shown in the figure, when the floating dock B is in the hoisting state, the magnetic levitation gap at the bow and stern increases, and the supporting load at this location is smaller, while the magnetic levitation gap at the midship decreases, and the supporting load at this location is larger; the floating dock B is always in a dynamic alternating change process between hoisting and sagging.

[0027] When the system is used, when the floating dock is ready to lift, several levitation electromagnets 2 are placed on the electromagnetic levitation track, and the magnetic attraction current is started to keep the two connected; after the lifting begins, the magnetic levitation current is started to separate the two and form a stable magnetic levitation force.

[0028] During the lifting process, based on the measured magnetic levitation gap and support load, the current of the electromagnetic coil 1 is adjusted to control the magnetic levitation force, so that the magnetic levitation force at different positions is within the set range. When the local support rail 3 is close to the levitation electromagnet 2, the load is large, that is, the magnetic levitation gap is too small, and the magnetic levitation force is too large, the current of each electromagnetic coil 1 is reduced synchronously to reduce the magnetic levitation force at this position; when the local support rail 3 is far away from the levitation electromagnet 2, the load is small, that is, the magnetic levitation gap is too large, and the magnetic levitation force is too small, the current of each electromagnetic coil 1 is increased synchronously to increase the magnetic levitation force at this position. By dynamically adjusting the magnetic levitation current at different positions in real time, the lifted ship is in a relatively stable load self-balancing state.

[0029] When the local electromagnetic support load is too large or too small, the magnetic levitation gap is too large or too small, that is, when the magnetic levitation gap and the support load measured by the gap ranging sensor 3 and the load measuring instrument 4 in real time exceed the set safe limit range, the alarm device 7 sends an alarm signal and reminds the corresponding abnormal position and range. When the magnetic levitation gap is further expanded and exceeds the permitted range, the safety protection chain 8 is tensioned to prevent the floating dock and the lifted ship body from being separated, and plays a safety protection role; when the magnetic levitation gap is within the safe range, the safety protection chain 8 is relaxed and in standby state.

[0030] The system uses the electromagnetic floating lifting device C to replace the existing dock pier structure, which can increase the contact support area of the floating dock and the ship body, and make the distribution of the lifting load more uniform and the amplitude fluctuation smaller. In addition, the fixed electromagnetic floating track can reduce the preparation time for each lifting and improve the work efficiency of the lifting operation.

[0031] Embodiment 2

[0032] The same as embodiment 1, the difference is that the support rail of this embodiment is uniformly arranged along the direction perpendicular to the ship body, and the length direction is parallel to the direction of the ship body, that is, parallel to the length direction of the floating dock. In this case, the support rail has a certain reinforcing effect on the floating dock, which can reduce the deformation of the floating dock under the action of waves.

[0033] The levitation electromagnet of this embodiment is arranged along the direction parallel to the ship body, and the length direction is perpendicular to the ship body and perpendicular to the support rail. Any levitation electromagnet is connected to a support rail through a safety protection chain; each levitation electromagnet is provided with a row of electromagnetic coils below, which are fixed on the support rails arranged in sequence. The gap ranging sensor of each group of electromagnetic floating lifting devices is arranged on the support rail in the middle.

[0034] The electromagnetic floating lifting device of this embodiment does not include a support rail, and each group of electromagnetic floating lifting devices are connected as a whole through the support rail.

Claims

1. A load self-balancing based floating dock electromagnetic floating and lifting system, characterized in that, The application relates to a ship electromagnetic floating lifting device, which comprises a plurality of electromagnetic floating lifting devices arranged along the ship body direction; the electromagnetic floating lifting device comprises a plurality of electromagnetic coils (1), a suspended electromagnet (2) in contact with and lifting the ship body and a controller (4); the electromagnetic coils (1) are installed on the floating dock bottom through support rails (3), the suspended electromagnet (2) is suspended above the electromagnetic coils (1) under the action of the magnetic field force generated by the electromagnetic coils (1), and the length direction of the suspended electromagnet (2) is perpendicular to the ship body direction; a plurality of load measuring instruments (5) are installed on the top of the suspended electromagnet (2), and a clearance distance sensor (6) for measuring the distance between the support rail (3) and the suspended electromagnet (2) is arranged below; the controller (4) is connected with the clearance distance sensor (6), the load measuring instrument (5) and the electromagnetic coil (1), and is connected with an alarm device (7); the controller (4) is internally provided with a limited magnetic floating force range and a limited clearance range; the current of the electromagnetic coil (1) is adjusted by comparing the measured values of the clearance distance sensor and the load measuring instrument with the limited magnetic floating force range and the limited clearance range; when the measured values are too large or too small, the controller (4) instructs the alarm device (7) to give an alarm.

2. The load self-balancing based electromagnetic floating and launching system of the floating dock according to claim 1, characterized in that, When the distance between the support rail (3) and the suspended electromagnet (2) is small and the load is large, the controller (4) reduces the current of the electromagnetic coil (1); when the distance between the support rail (3) and the suspended electromagnet (2) is large and the load is small, the current of the electromagnetic coil (1) is increased.

3. The load self-balancing based floating dock electromagnetic floating and hoisting system according to claim 1, characterized in that, The controller (4) calculates the average value of the measured values of the load measuring instruments (5), compares the average value with the limited magnetic floating force range, and simultaneously controls the current of each electromagnetic coil (1) to change synchronously.

4. The load self-balancing based floating dock electromagnetic floating and hoisting system according to claim 1, characterized in that, The support rail (3) and the suspended electromagnet (2) are connected through a safety protection chain (8), and the safety protection chain (8) limits the maximum displacement of the suspended electromagnet (2) to the floating dock bottom.

5. The load self-balancing based floating dock electromagnetic floating and hoisting system according to claim 1, characterized in that, The electromagnetic floating lifting devices are distributed with small distances in the middle area of the ship and large distances in the two side areas.

6. The load self-balancing based electromagnetic floating and launching system of the pontoon according to claim 5, characterized in that, The electromagnetic coils (1) are uniformly arranged along the length direction of the suspended electromagnet (2).

7. The load self-balancing based electromagnetic floating and launching system of the pontoon according to claim 1, characterized in that, The support rails (3) are arranged in parallel to the ship body direction, and correspond to the suspended electromagnets (2) one by one in the up-down direction, and the length direction of the support rails (3) is perpendicular to the ship body direction.

8. The load self-balancing based electromagnetic floating and launching system of the pontoon according to claim 7, characterized in that, The clearance distance sensors (6) are installed at the middle positions of the support rails (3).

9. The load self-balancing based floating dock electromagnetic floating and hoisting system according to claim 1, characterized in that, The support rails (3) are arranged along the direction perpendicular to the ship body direction, and the length direction of the support rails (3) is parallel to the ship body direction.

10. The load self-balancing based electromagnetic floating and launching system of the pontoon according to claim 9, characterized in that, The middle part of the support rail (3) is provided with a plurality of clearance distance sensors (6) corresponding to the suspended electromagnets (2) one by one.

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