A ship moon pool mechanism with a double pulley system

Abstract

The present invention discloses a ship moonpool mechanism with a double pulley system, comprising a moonpool channel and a moonpool ceiling located above the moonpool channel, wherein the inner wall of the moonpool channel is provided with a first slide rail and a second slide rail, wherein the first slide rail is provided with a first pulley, and the second slide rail is provided with a second pulley; the moonpool ceiling is provided with a lifting device connected to the first pulley and the second pulley, and the lifting device is used to drag the first pulley and the second pulley to either be raised or lowered independently or to be raised or lowered synchronously. The moonpool mechanism of this solution can adapt to a variety of lifting needs and can be applied to more usage scenarios. In addition, since two pulley systems are provided in this solution, when one pulley system fails, the other pulley system can be used to realize the mutual backup function between the two pulley systems.

Description

Technical Field

[0001] The present application relates to the field of ship technology, and in particular to a ship moon pool mechanism with a double pulley system. Background Art

[0002] A moonpool, primarily used in marine engineering, is a structure that extends from the surface into the water and through the floating structure. It penetrates all decks and connects to the seawater, creating a more stable microclimate in the harsh marine environment than the surrounding environment of the floating structure. A pulley system installed on the moonpool allows scientific research equipment or other underwater equipment to be transported directly below sea level, avoiding waves and ice, enabling various underwater operations.

[0003] Traditional moonpools are equipped with only one set of pulleys, which can only carry out the deployment and retraction operations of one device at a time. If two devices need to be deployed or retrieved simultaneously in the moonpool, the traditional set of pulleys will not be able to cope with it. Therefore, the use function of existing ship moonpools has great limitations. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a ship moonpool mechanism with a double pulley system, which can solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] A ship moonpool mechanism with a double pulley system includes a moonpool channel and a moonpool ceiling located above the moonpool channel, wherein the inner wall of the moonpool channel is provided with a first slide rail and a second slide rail, the first slide rail is mounted on the first slide rail, and the second slide rail is mounted on the second slide rail; a lifting device connected to the first pulley and the second pulley is provided on the moonpool ceiling, and the lifting device is used to drag the first pulley and the second pulley to either rise or fall independently or both rise and fall synchronously.

[0007] Optionally, the lifting device includes a first winch and a second winch, the first winch is connected to the first pulley via a first cable, and the second winch is connected to the second pulley via a second cable.

[0008] Optionally, the lifting device includes a winch and a pulley group, the pulley group includes a first movable pulley fixedly mounted on the first pulley and a second movable pulley fixedly mounted on the second pulley, one end of the cable is fixed to the ceiling of the moon pool, and the other end passes around the first movable pulley and the second movable pulley and is connected to the winch, and by controlling the movement and stopping states of the first movable pulley and the second movable pulley, the first pulley and the second pulley can be controlled to rise and fall independently or rise and fall synchronously.

[0009] Optionally, the first pulley is provided with a first brake device, and the second pulley is provided with a second brake device. By controlling the first brake device and the second brake device, the movement and stopping states of the first pulley and the second pulley can be controlled respectively, thereby controlling the movement and stopping states of the first movable pulley and the second movable pulley.

[0010] Optionally, the pulley group further includes a first fixed pulley, a second fixed pulley and a third movable pulley, the first fixed pulley and the second fixed pulley are respectively fixed to the moon pool ceiling, the third movable pulley is connected to the first pulley or the second pulley, and the cable passes through the first movable pulley, the first fixed pulley, the third movable pulley, the second fixed pulley and the second movable pulley in sequence.

[0011] Optionally, the third movable pulley is connected to the connecting rod, the first pulley is provided with a first connecting seat, the second pulley is provided with a second connecting seat, and the first connecting seat and the second connecting seat are respectively detachably connected to the connecting rod.

[0012] Optionally, a first guide wheel is fixed to a side of the first pulley close to the second pulley, and a second guide wheel is fixed to a side of the second pulley close to the first pulley. When the third movable pulley is located below the first pulley, the first guide wheel supports the cable to prevent the first pulley from interfering with the cable; when the third movable pulley is located below the second pulley, the second guide wheel supports the cable to prevent the second pulley from interfering with the cable.

[0013] Optionally, a third connecting seat is provided on the moon pool ceiling between the first fixed pulley and the second fixed pulley, and the third connecting seat is detachably connected to the connecting rod.

[0014] Optionally, the pulley assembly further includes a third fixed pulley, which is arranged between the winch and the second fixed pulley. After the cable passes around the second movable pulley, it first passes around the third fixed pulley and then connects to the winch.

[0015] Optionally, a docking component is further included, through which the first pulley and the second pulley are connected at the same time to achieve synchronization of controlling the lifting and lowering movements of the first pulley and the second pulley.

[0016] The beneficial effects of the present application are as follows: the present invention provides a ship moon pool mechanism with a double pulley system, in which two pulley systems are provided on the inner wall of the moon pool channel, and the lifting and lowering of the two pulleys can be independently controlled. When only one set of equipment needs to be lifted, the equipment can be installed under the first pulley or the second pulley, and only one pulley is driven to lift and lower for lifting, thereby reducing energy consumption; when two sets of equipment need to be lifted at the same time, or the equipment to be lifted is large in size, the first pulley and the second pulley can be activated at the same time, and the two sets of equipment can be installed under the first pulley and the second pulley respectively, or the large-sized equipment can be connected to the first pulley and the second pulley at the same time, and the two pulleys can be driven to lift and lower for lifting, thereby improving the stability of the lifting. Therefore, the moon pool mechanism of this solution can adapt to a variety of lifting needs and can be applied to more usage scenarios. In addition, since two pulley systems are provided in this solution, when one pulley system fails, the other pulley system can be used to realize the mutual backup function between the two pulley systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application is further described in detail below with reference to the accompanying drawings and examples.

[0018] Figure 1 This is a structural diagram of one embodiment of the ship moon pool mechanism with a double pulley system described in the embodiments of the present application;

[0019] Figure 2 This is a structural schematic diagram of another embodiment of the ship moon pool mechanism with a double pulley system described in an embodiment of the present application;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure in which the first pulley and the second pulley are simultaneously activated;

[0021] Figure 4 for Figure 2 A schematic diagram of the structure of one of the use states when the first pulley in the structure shown is activated alone;

[0022] Figure 5 for Figure 2 A schematic structural diagram of another usage state when the first pulley in the structure shown is activated alone.

[0023] In the picture:

[0024] 11. Moon pool passage; 12. Moon pool ceiling; 21. First slide rail; 22. First pulley; 31. Second slide rail; 32. Second pulley; 41. First winch; 42. Second winch; 43. Winch; 5. Pulley block; 51. First movable pulley; 52. Second movable pulley; 53. Third movable pulley; 531. Connecting rod; 54. First fixed pulley; 55. Second fixed pulley; 56. Third fixed pulley; 57. First guide pulley; 58. Second guide pulley; 59. Cable; 6. Equipment. DETAILED DESCRIPTION

[0025] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0026] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] like Figure 1-5As shown, this embodiment provides a ship moonpool mechanism with a double pulley system, including a moonpool channel 11 and a moonpool ceiling 12 located above the moonpool channel 11, the inner wall of the moonpool channel 11 is provided with a first slide rail 21 and a second slide rail 31, the first slide rail 21 is installed on the first slide rail 21, and the second pulley 32 is installed on the second slide rail 31; the moonpool ceiling 12 is provided with a lifting device connected to the first pulley 22 and the second pulley 32, and the lifting device is used to drag the first pulley 22 and the second pulley 32 to either rise or fall independently or both rise and fall synchronously.

[0029] The first slide rail 21 can guide the linear lifting of the first trolley 22 , and the second slide rail 31 can guide the linear lifting of the second trolley 32 , thereby ensuring the stability of the lifting process of the first trolley 22 and the second trolley 32 .

[0030] The lifting device can drag either the first pulley 22 or the second pulley 32 to rise and fall independently or both to rise and fall synchronously, which means that the rising and falling of the first pulley 22 and the second pulley 32 can be controlled independently. When necessary, one of the first pulley 22 and the second pulley 32 can be started separately to work, or the first pulley 22 and the second pulley 32 can be started at the same time to work together.

[0031] In this embodiment, two pulley systems are installed on the inner wall of the moon pool channel 11, and the lifting and lowering of the two pulleys can be controlled independently. When only one set of equipment 6 needs to be lifted, the equipment 6 can be installed under the first pulley 22 or the second pulley 32, and only one pulley can be driven to lift and lower it, thereby reducing energy consumption. When two sets of equipment 6 need to be lifted simultaneously, the first pulley 22 and the second pulley 32 can be activated simultaneously, and the two sets of equipment 6 can be installed under the first pulley 22 and the second pulley 32 respectively to achieve simultaneous lifting. Or, if the equipment 6 to be lifted is large in size, the large-sized equipment 6 can be connected to both the first pulley 22 and the second pulley 32, and both pulleys can be driven to lift and lower it simultaneously, thereby improving the lifting capacity and the lifting stability. As can be seen from the above, the dual pulley system of this embodiment can deploy and recover heavier equipment. For example, if the load of a single pulley is 10 tons, the dual pulley can lift (10+10)x0.8=16 tons of equipment.

[0032] Therefore, the moon pool mechanism of this solution can adapt to various lifting requirements and can be applied to more usage scenarios. In addition, since this solution has two pulley systems, when one pulley system fails, the other pulley system can be used, realizing the mutual backup function between the two pulley systems.

[0033] In order to realize independent control of the first pulley 22 and the second pulley 32, in one embodiment, referring to Figure 1The lifting device includes a first winch 41 and a second winch 42. The first winch 41 is connected to the first pulley 22 through a first cable, and the second winch 42 is connected to the second pulley 32 through a second cable.

[0034] In this method, the first pulley 22 and the second pulley 32 are each equipped with a first winch 41 and a second winch 42. When the first pulley 22 is used alone, the first winch 41 is activated alone; when the second pulley 32 is used alone, the second winch 42 is activated alone. When both pulleys are used simultaneously, the first winch 41 and the second winch 42 are activated simultaneously. This solution provides a backup for the first winch 41 and the second winch 42. If one fails, the other can be activated to maintain normal operation.

[0035] In order to realize independent control of the first pulley 22 and the second pulley 32, in one embodiment, referring to Figure 2-5 The lifting device includes a winch 43 and a pulley group 5, and the pulley group 5 includes a first movable pulley 51 fixedly mounted on the first pulley 22 and a second movable pulley 52 fixedly mounted on the second pulley 32. One end of the cable 59 is fixed to the moon pool ceiling 12, and the other end passes around the first movable pulley 51 and the second movable pulley 52 and is connected to the winch 43. By controlling the movement and stopping states of the first movable pulley 51 and the second movable pulley 52, the first pulley 22 and the second pulley 32 can be controlled to rise and fall independently or rise and fall synchronously.

[0036] The movement and stopping states of the first movable pulley 51 and the second movable pulley 52 specifically include a sliding state and a locked state. In the sliding state, when the cable 59 is loosened, the first movable pulley 51 or the second movable pulley 52 will be driven to slide downward under the action of gravity of the first pulley 22 or the second pulley 32; in the locked state, even if the cable 59 is loosened, the first pulley 22 or the second pulley 32 can only remain fixed.

[0037] Therefore, when the first pulley 22 is used alone, the first movable pulley 51 is loosened to put it in a sliding state, the second movable pulley 52 is locked to put it in a locked state, and when the winch 43 hoists the cable 59, the first pulley 22 will be dragged up and down alone; conversely, when the second pulley 32 is used alone, the second movable pulley 52 is loosened to put it in a sliding state, the first movable pulley 51 is locked to put it in a locked state, and when the winch 43 hoists the cable 59, the second pulley 32 will be dragged up and down alone; when the first pulley 22 and the second pulley 32 are used at the same time, the first movable pulley 51 and the second movable pulley 52 are loosened at the same time.

[0038] This solution adopts the pulley block 5 to wind the cable 59, so as to realize independent control of the first pulley 22 and the second pulley 32 while using one winch 43, thereby effectively reducing the equipment cost of the lifting device while ensuring the functional use.

[0039] At the same time, this solution installs a first movable pulley 51 and a second movable pulley 52 on the first pulley 22 and the second pulley 32 respectively. The structure of the movable pulley can achieve a multiple reduction in the tension of the cable 59, reduce the load of the winch 43, and ensure the stable operation of the winch 43.

[0040] In order to achieve control over the movement and stopping states of the first movable pulley 51 and the second movable pulley 52, in one embodiment, a first brake device is provided on the first pulley 22, and a second brake device is provided on the second pulley 32. By controlling the first brake device and the second brake device, the movement and stopping states of the first pulley 22 and the second pulley 32 are controlled respectively, thereby controlling the movement and stopping states of the first movable pulley 51 and the second movable pulley 52.

[0041] That is, when the first pulley 22 is not in use, the first brake device is directly applied to lock the first pulley 22 to the first slide rail 21, thereby fixing the first movable pulley 51 mounted on the first pulley 22; when the second pulley 32 is not in use, the second brake device is directly applied to lock the second pulley 32 to the second slide rail 31, thereby fixing the second movable pulley 52 mounted on the second pulley 32. This solution directly uses the brake device provided on the pulley to lock the pulley, thereby ensuring the reliability of fixing the first pulley 22 and the second pulley 32 in the locked state.

[0042] Among them, the function of the first brake device and the second brake device is to lock the pulley on the slide rail. Those skilled in the art can directly apply the brake structure on the existing sliding device to this solution.

[0043] Regarding the pulley group 5, in one embodiment, the pulley group 5 also includes a first fixed pulley 54, a second fixed pulley 55 and a third movable pulley 53. The first fixed pulley 54 and the second fixed pulley 55 are respectively fixed to the moon pool ceiling 12, and the third movable pulley 53 is connected to the first pulley 22 or the second pulley 32. The cable 59 passes around the first movable pulley 51, the first fixed pulley 54, the third movable pulley 53, the second fixed pulley 55 and the second movable pulley 52 in sequence.

[0044] The third movable pulley 53 is provided between the first movable pulley 51 and the second movable pulley 52 , so as to further save the tension of the cable 59 and reduce the load of the winch 43 .

[0045] Specifically, when the third movable pulley 53 is connected to the first pulley 22 and the first pulley 22 is activated, the third movable pulley 53 follows the first pulley 22 in rising and falling movements. At this time, the first pulley 22 has two movable pulleys, the first movable pulley 51 and the third movable pulley 53, and the pulling force of the cable 59 on the first pulley 22 is 1 / 4 of the sum of the weight of the first pulley 22 and the equipment 6 loaded thereon; similarly, when the third movable pulley 53 is connected to the second pulley 32 and the second pulley 32 is activated, the third movable pulley 53 follows the second pulley 32 in rising and falling movements. At this time, the second pulley 32 has two movable pulleys, the second movable pulley 52 and the third movable pulley 53, and the pulling force of the cable 59 on the second pulley 32 is 1 / 4 of the sum of the weight of the second pulley 32 and the equipment 6 loaded thereon.

[0046] In order to realize the connection between the third movable pulley 53 and the first pulley 22 or the second pulley 32, in one embodiment, the third movable pulley 53 is connected to the connecting rod 531, the first pulley 22 is provided with a first connecting seat, and the second pulley 32 is provided with a second connecting seat, and the first connecting seat and the second connecting seat are respectively detachably connected to the connecting rod 531.

[0047] Therefore, only one third movable pulley 53 needs to be provided, and the connecting rod 531 can be connected to the first connecting seat or the second connecting seat as required, so that the first pulley 22 and the second pulley 32 can share the third movable pulley 53. Therefore, this structure simplifies the structure of the pulley assembly 5 and reduces the cost of the device.

[0048] Regarding the detachable connection between the connecting rod 531 and the first connecting seat and the second connecting seat, optionally, a first connecting hole is provided at the end of the connecting rod 531 away from the third movable pulley 53, and a second connecting hole is provided on the first connecting seat and the second connecting seat respectively. By passing the bolt through the first connecting hole and the second connecting hole and then connecting it with the nut, the detachable connection between the connecting rod 531 and the first connecting seat and the second connecting seat can be achieved.

[0049] Regarding the structure of the third movable pulley 53, in one embodiment, the third movable pulley 53 includes a roller and two bracket plates respectively arranged on both sides of the roller, the two bracket plates are connected by a support shaft, and the roller is rotatably installed on the support shaft; each of the bracket plates is connected to one of the connecting rods 531.

[0050] During installation, the two connecting rods 531 are connected to the first connecting seat at the same time, or are connected to the second connecting seat at the same time.

[0051] During use, before loosening the connecting rod 531 , the first pulley 22 and the second pulley 32 need to be locked first to prevent the cable 59 from loosening after loosening the connecting rod 531 , causing the first pulley 22 or the second pulley 32 to fall.

[0052] Furthermore, a first guide wheel 57 is fixed to the side of the first pulley 22 close to the second pulley 32, and a second guide wheel 58 is fixed to the side of the second pulley 32 close to the first pulley 22. When the third movable pulley 53 is located below the first pulley 22, the first guide wheel 57 supports the cable 59 to prevent the first pulley 22 from interfering with the cable 59; when the third movable pulley 53 is located below the second pulley 32, the second guide wheel 58 supports the cable 59 to prevent the second pulley 32 from interfering with the cable 59.

[0053] Specifically, refer to Figure 5 In the state shown, when the first pulley 22 is activated alone and the third movable pulley 53 is connected to the first pulley 22, the third movable pulley 53 will rise and fall synchronously with the first pulley 22. When the third movable pulley 53 moves below the second pulley 32, the portion of the cable 59 between the third movable pulley 53 and the second fixed pulley 55 is too close to the second pulley 32, which may cause interference and friction between the cable 59 and the second pulley 32. Therefore, in this solution, a second guide pulley 58 is provided on the second pulley 32. The second guide pulley 58 can support this portion of the cable 59 away from the second pulley 32, thereby avoiding the aforementioned problem. The purpose of the first guide pulley 57 is the same as that of the second guide pulley 58, and they can be understood in conjunction with each other.

[0054] In one embodiment, a third connecting seat is provided on the moon pool ceiling 12 between the first fixed pulley 54 and the second fixed pulley 55 , and the third connecting seat is detachably connected to the connecting rod 531 .

[0055] Reference Figure 2 or Figure 4 When the connecting rod 531 is connected to the third connecting seat, the third movable pulley 53 is used as a fixed pulley. It does not rise or fall with the first pulley 22 or the second pulley 32, so it does not make any labor-saving contribution to the pulley assembly 5.

[0056] Based on the principle that the useful work done by the cable 59 in pulling the first pulley 22 or the second pulley 32 upward and downward is constant, the third movable pulley 53 used as a fixed pulley does not contribute to labor saving, and the presence of the third movable pulley 53 in this case does not extend the extension length of the cable 59. Therefore, when the winch 43 rotates at the same speed, the first pulley 22 or the second pulley 32 can be raised and lowered faster when the third movable pulley 53 is used as a fixed pulley than when the third movable pulley 53 is used as a movable pulley.

[0057] Based on this, when the weight of the towed device 6 is relatively heavy, the connecting rod 531 can be connected to the first or second connecting seat to reduce the pulling force; when the weight of the towed device 6 is relatively light, the connecting rod 531 can be connected to the third connecting seat to increase the speed. In other words, when the rated power of the winch 43 is fixed, this solution allows the connection position of the connecting rod 531 to be freely selected based on the actual weight of the device 6, thereby maximizing the pulling efficiency while ensuring sufficient pulling force.

[0058] In one embodiment, the pulley group 5 further includes a third fixed pulley 56 , which is disposed between the winch 43 and the second fixed pulley 55 . After the cable 59 passes around the second movable pulley 52 , it first passes around the third fixed pulley 56 and then connects to the winch 43 .

[0059] A third fixed pulley 56 is provided between the winch 43 and the second fixed pulley 55 to support and guide the cable 59 and avoid interference and friction between the cable 59 and the second slide rail 31 .

[0060] In one embodiment, the moon pool mechanism of a ship with a double pulley system further includes a docking component, through which the first pulley 22 and the second pulley 32 are simultaneously connected to achieve synchronization of controlling the lifting and lowering movements of the first pulley 22 and the second pulley 32.

[0061] Specifically, the docking member is a detachable bracket structure. When its ends are connected to the first pulley 22 and the second pulley 32, respectively, the first pulley 22 and the second pulley 32 can be raised and lowered integrally. In a specific implementation, the docking member can be a structure including a profile and bolts. The profile has third connecting holes on both sides, and the first pulley 22 and the second pulley 32 are respectively provided with fourth connecting holes. The bolts pass through the third and fourth connecting holes and are connected with nuts to achieve the docking function of the first pulley 22 and the second pulley 32.

[0062] Based on the setting of the docking member, when the first pulley 22 and the second pulley 32 are used at the same time, the synchronization of the lifting and lowering of the two can be ensured, avoiding the problem that the two cannot be lifted and lowered synchronously due to the different weights of the equipment 6 loaded on the two.

[0063] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other positions or relationships are used solely for ease of description and simplified operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0064] In this specification, reference to terms such as "one embodiment" or "example" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0065] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0066] The technical principles of the present application have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the present application and are not to be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present application without inventive effort, and such implementations will fall within the scope of protection of the present application.

Claims

1. A moon pool mechanism for a ship with a double pulley system, characterized in that: The invention comprises a moon pool channel (11) and a moon pool ceiling (12) located above the moon pool channel (11); the inner wall of the moon pool channel (11) is provided with a first slide rail (21) and a second slide rail (31); the first slide rail (21) is provided with a first pulley (22); the second slide rail (31) is provided with a second pulley (32); the moon pool ceiling (12) is provided with a lifting device connected with the first pulley (22) and the second pulley (32); the lifting device is used to drag the first pulley (22) and the second pulley (32) to either be raised or lowered independently or both to be raised or lowered synchronously.

2. The ship moon pool mechanism with a double pulley system according to claim 1, characterized in that: The hoisting device comprises a first winch (41) and a second winch (42), wherein the first winch (41) is connected to the first pulley (22) via a first cable, and the second winch (42) is connected to the second pulley (32) via a second cable.

3. The ship moon pool mechanism with a double pulley system according to claim 1, characterized in that: The hoisting device includes a winch (43) and a pulley group (5), wherein the pulley group (5) includes a first movable pulley (51) fixedly mounted on the first pulley (22) and a second movable pulley (52) fixedly mounted on the second pulley (32); one end of a cable (59) is fixed to the moon pool ceiling (12), and the other end passes through the first movable pulley (51) and the second movable pulley (52) and is connected to the winch (43); by controlling the movement state of the first movable pulley (51) and the second movable pulley (52), the first pulley (22) and the second pulley (32) can be controlled to rise and fall independently or rise and fall synchronously.

4. The ship moon pool mechanism with a double pulley system according to claim 3, characterized in that: The first pulley (22) is provided with a first brake device, and the second pulley (32) is provided with a second brake device. By controlling the first brake device and the second brake device, the movement and stopping states of the first pulley (22) and the second pulley (32) are controlled respectively, thereby controlling the movement and stopping states of the first movable pulley (51) and the second movable pulley (52).

5. The ship moon pool mechanism with a double pulley system according to claim 3, characterized in that: The pulley assembly (5) further comprises a first fixed pulley (54), a second fixed pulley (55) and a third movable pulley (53); the first fixed pulley (54) and the second fixed pulley (55) are respectively fixed to the moon pool ceiling (12); the third movable pulley (53) is connected to the first pulley (22) or the second pulley (32); the cable (59) passes through the first movable pulley (51), the first fixed pulley (54), the third movable pulley (53), the second fixed pulley (55) and the second movable pulley (52) in sequence.

6. The ship moon pool mechanism with a double pulley system according to claim 5, characterized in that: The third movable pulley (53) is connected to the connecting rod (531), the first pulley (22) is provided with a first connecting seat, and the second pulley (32) is provided with a second connecting seat, and the first connecting seat and the second connecting seat are respectively detachably connected to the connecting rod (531).

7. The ship moon pool mechanism with a double pulley system according to claim 6, characterized in that: A first guide wheel (57) is fixed on the side of the first pulley (22) close to the second pulley (32), and a second guide wheel (58) is fixed on the side of the second pulley (32) close to the first pulley (22). When the third movable pulley (53) is located below the first pulley (22), the first guide wheel (57) supports the cable (59) to prevent the first pulley (22) from interfering with the cable (59); when the third movable pulley (53) is located below the second pulley (32), the second guide wheel (58) supports the cable (59) to prevent the second pulley (32) from interfering with the cable (59).

8. The ship moon pool mechanism with a double pulley system according to claim 6, characterized in that: The moon pool ceiling (12) is provided with a third connecting seat between the first fixed pulley (54) and the second fixed pulley (55), and the third connecting seat is detachably connected to the connecting rod (531).

9. The ship moon pool mechanism with a double pulley system according to claim 5, characterized in that: The pulley assembly (5) further includes a third fixed pulley (56), which is arranged between the winch (43) and the second fixed pulley (55). After the cable (59) passes around the second movable pulley (52), it first passes around the third fixed pulley (56) and then connects to the winch (43).

10. The ship moon pool mechanism with a double pulley system according to claim 1, characterized in that: It also includes a docking component, through which the first pulley (22) and the second pulley (32) are connected at the same time, so as to realize the synchronization of controlling the lifting movement of the first pulley (22) and the second pulley (32).

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