Multipurpose polar region moon pool retracting and releasing system

Abstract

The invention relates to a multipurpose polar region moon pool folding and unfolding system. A working platform is arranged on a ship body frame at the top of a moon pool cabin; the lifting winch and the umbilical cable winch are arranged on the working platform, the ROV track is arranged on the cabin wall on one side of the moon pool, and the ROV tackle is installed on the ROV track through idler wheels and moves up and down in the ROV track. The CTD track is arranged on the bulkhead on one side of the moon pool, and the CTD tackle is mounted on the CTD track through rollers and moves up and down in the CTD track; the guide joint is connected with an ROV hoisting winch through two cables; the device is used for butt joint and release with an ROV on a deck or under water. The CTD tackle is provided with a turnover oil cylinder, and the working state and the storage state of the ROV tackle are changed through stretching and retracting of the turnover oil cylinder. The tower lock is arranged at the lower part of the working platform and is used for storing and maintaining the ROV tackle and the ROV guide joint; and the underwater HPU is respectively used for driving the mechanism on the guide joint and the mechanism on the CTD tackle to act.

Description

Technical Field

[0001] The invention relates to a moon pool retracting and launching system for a polar region experimental scientific research vessel, in particular to a multi-purpose polar region moon pool retracting and launching system. Background Art

[0002] Polar region experimental research vessels are important support for deep-sea exploration. When going out to sea, they need to carry a variety of detection and underwater equipment. These equipment take up a large space on the deck, affecting the safety of operations. The moon pool deployment and recovery system is installed on the deep-sea (polar region) deep-diving and comprehensive operation mother ship, which is used for the deployment and recovery support of unmanned remote-controlled submersibles (ROVs), CTD water samplers and other scientific research instruments and equipment, and takes into account other scientific research operations, meeting the needs of deep-sea and polar region scientific research operations.

[0003] At present, the widely used methods for deploying and retrieving submersibles mainly include A-frame deployment and recovery, special single-arm deployment and recovery, slide deployment and recovery, etc. In order to complete the deployment and retrieving operation in high sea conditions, as in CN112173012, a moon pool system is used to complete the deployment and retrieving of submersibles. For example, in the patent CN221340957, a moon pool for concealed deployment of underwater equipment is designed. Integrating unmanned remote-controlled submersibles ROV, CTD water samplers, AUVs, etc. into one platform can effectively increase work efficiency. When designing a moon pool deployment and retrieving system, it is inevitable to consider safety, stability and operability during operation. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a multi-purpose polar moonpool collection and deployment system, which integrates the functions of deploying ROV, CTD and AUV on a common platform. Through this collection and deployment system, the deployment and recovery operations of ROV, CTD and AUV in the polar moonpool can be completed.

[0005] To achieve the above object, the technical scheme of the present invention is: a multi-purpose polar moon pool collection and release system, used to support the collection and release operation of unmanned submersibles ROV, CTD water samplers, and AUVs, including a working platform, a lifting winch, an umbilical cable winch, a track, a tower lock, a pulley, a guide joint, a bracket, and an underwater HPU. The working platform is arranged on the hull frame at the top of the moon pool cabin; the lifting winch and the umbilical cable winch are arranged on the working platform, the ROV track is arranged on the bulkhead on one side of the moon pool, and the ROV pulley is installed on the ROV track through rollers and moves up and down in the ROV track; C The TD track is arranged on the bulkhead on one side of the moon pool. The CTD pulley is installed on the CTD track through rollers and moves up and down in the CTD track. The guide head is connected to the ROV lifting winch through two cables. It is used for docking and release with the ROV on the deck or underwater. The CTD pulley is equipped with a tilting cylinder, and the working state and storage state of the ROV pulley are changed by the extension and retraction of the tilting cylinder. The tower lock is arranged at the bottom of the working platform and is used for the storage and maintenance of the ROV pulley and ROV guide head. The underwater HPU is used to drive the mechanism actions on the guide head and the CTD pulley respectively.

[0006] Furthermore, the working platform is welded from steel sections into a frame structure; grid platforms are arranged inside and around the working platform for operation and maintenance.

[0007] Furthermore, the lifting winch includes an ROV lifting winch and a CTD lifting winch. The ROV lifting winch is used to lift the ROV pulley and the guide joint, and the CTD lifting winch is used to lift the CTD pulley. The lifting winch is composed of a spiral drum, a frame, a flange shaft, a reducer, a hydraulic motor, a lifting cable and accessories, and a force and speed measuring device. The lifting winch is driven by a hydraulic motor, and the reducer adopts an internal shell-rotor structure and is equipped with a normally closed brake, and the normally closed brake is hydraulically controlled.

[0008] Furthermore, the umbilical cable winch includes an ROV umbilical cable winch and a CTD umbilical cable winch, and the ROV umbilical cable winch and the CTD umbilical cable winch are respectively arranged on one side of the ROV lifting winch and the CTD lifting winch 2 for retracting and releasing the umbilical cable; the umbilical cable winch is composed of a drum, a frame, a flange shaft, an umbilical cable, and an electric slip ring, and the umbilical cable winch shares the power of the lifting winch through a transmission gear pair; the drum adopts the same rope groove parameters as the lifting winch to ensure synchronous retraction and release with the lifting winch.

[0009] Furthermore, the track consists of an upper fixed track, a lower fixed track, wheels, a telescopic track, and a telescopic cylinder. The ROV track is designed with H-shaped steel. The fixed track is divided into two sections, the upper fixed track is arranged above the main deck, and the lower fixed track is arranged inside the moon pool. The fixed track cannot be arranged in the middle due to the moon pool hatch cover; the telescopic track is mainly arranged on the upper fixed track, and the telescopic track and the wheels rise and fall in the upper fixed track groove under the action of the telescopic cylinder; the lower end of the telescopic track and the upper end of the lower fixed track adopt a docking groove structure to ensure the track docking accuracy and load-bearing capacity.

[0010] Furthermore, the tower lock consists of an upper tower frame and a lower tower frame. The upper part of the upper tower frame is connected to the bottom of the working platform, and the lower part is connected to the lower tower frame. The lower tower frame is arranged with a universal locking mechanism, which can automatically lock and actively unlock. The tower lock is also equipped with a limit switch to indicate the working status of the lock tongue and control the ROV lifting winch to lift into place.

[0011] Furthermore, the pulley includes an ROV pulley and a CTD pulley, wherein the ROV pulley is composed of a pulley frame, wheels, and guide pulleys, and the CTD pulley is composed of a pulley frame, wheels, guide pulleys, a locking mechanism, a damper, and a flip cylinder; the pulley frame is welded into a frame structure by hollow square steel, wheels are installed on the sides of the pulley frame, a lifting cable guide pulley is installed on the top, and a joint is designed in the middle of the frame for docking the ROV guide joint and the CTD water sampler; the wheels are divided into guide wheels and running wheels, the guide wheels are arranged on one side of the track for guiding and bearing in the direction of the length of the ship, and the running wheels are arranged on both sides of the track for guiding and bearing in the direction of the width of the ship; the damper adopts a spring type, and a guide cylinder is provided in the middle of the spring for telescopic guidance, and the lower part of the damper is a buffer ring; a rubber buffer pad is adopted at the bottom of the buffer ring; the locking mechanism adopts an action cylinder and a reset spring, which can realize the locking and release of the CTD water sampler; the flip cylinder changes the working state and storage state of the pulley by telescoping, thereby reducing the storage space occupied by the pulley.

[0012] Furthermore, a plurality of lifting ears are arranged on the upper part of the guide joint for lifting and lowering, and the middle top is a load-bearing head structure closed with the tower lock.

[0013] Furthermore, the bracket includes an ROV bracket and a CTD bracket, wherein the ROV bracket is composed of an ROV maintenance bracket and an ROV limit bracket, and the CTD bracket is similar in structure to the ROV bracket, and is divided into a CTD maintenance bracket and a CTD limit bracket. The maintenance bracket is installed on the bulkhead of the upper deck of the moon pool, and is composed of a bracket, a tilting cylinder, a bracket and a pin.

[0014] Furthermore, the underwater HPU includes ROV underwater HPU and CTD underwater HPU, and the underwater HPU is composed of a pump group, a valve group, an oil tank, and a compensator.

[0015] The beneficial effects brought by the technical solution of the present invention are as follows:

[0016] 1) The multi-purpose polar moon pool deployment system integrates the functions of deploying ROV, CTD, and concealed scientific research equipment on a common platform, rationally utilizes limited space, and increases the operability of deploying and retracting scientific research equipment.

[0017] 2) Both the ROV pulley and the CTD pulley can be considered to be rigidly connected to the ROV and CTD, which can effectively stop the swing and ensure the stability of the ROV and CTD retraction and deployment.

[0018] 3) The CTD pulley is equipped with a tilting cylinder, which can change the working state and storage state of the pulley by extending and retracting the tilting cylinder, effectively reducing the space occupied by the pulley in the storage state and facilitating storage.

[0019] 4) The configured limit switch can effectively indicate the lifting working status, and the limit bracket can ensure the safety of the retracting and releasing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the composition of the multi-purpose polar moon pool collection and release system;

[0021] Figure 2 It is a schematic diagram of the winch layout of the multi-purpose polar moon pool;

[0022] Figure 3 This is a schematic diagram of the upper part of the ROV orbit moon pool layout structure of the multi-purpose polar moon pool recovery and deployment system;

[0023] Figure 4 This is a schematic diagram of the ROV pulley composition of the multi-purpose polar moon pool recovery and deployment system;

[0024] Figure 5 This is a schematic diagram of the CTD pulley composition of the multi-purpose polar moon pool recovery and release system;

[0025] Figure 6 It is a schematic diagram of the storage status of the multi-purpose polar moon pool collection and release system;

[0026] Figure 7 This is a schematic diagram of the ROV deployment work of the multi-purpose polar moon pool recovery and deployment system;

[0027] Figure 8 This is a schematic diagram of the CTD deployment work of the multi-purpose polar moon pool collection and deployment system. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figures 1 to 6As shown, a multi-purpose polar moon pool collection and release system of the present invention is used to support the collection and release operations of unmanned submersibles ROV, CTD water samplers, and AUV. The CTD and ROV armored cables are connected to the submersible through guide wheels, and are mainly composed of a working platform 1, a lifting winch, an umbilical cable winch, a track 4, a tower lock 5, a pulley, a guide joint 7, a bracket, and an underwater HPU.

[0030] The working platform 1 is the main load-bearing structure, which is mainly welded into a frame structure by steel sections. The working platform 1 is placed on the longitudinal beam on the top of the moon pool cabin. The working platform 1 is equipped with ROV lifting winch 2.1, ROV umbilical winch 3.1, CTD lifting winch 2.2, CTD umbilical winch 3.2, etc., and the tower lock 5 is arranged at the bottom of the working platform 1. Grid platforms are arranged inside and around the working platform 1 for operation and maintenance.

[0031] The lifting winch is composed of ROV lifting winch 2.1 and CTD lifting winch 2.2. ROV lifting winch 2.1 is used to lift ROV pulley 6.1 and guide joint 7, and CTD lifting winch 2.2 is used to lift CTD pulley 6.2. The lifting winch is composed of a spiral drum, a frame, a flange shaft, a reducer (with a brake), a hydraulic motor, a lifting cable and accessories, and a force and speed measuring device. The lifting winch is driven by a hydraulic motor. The reducer adopts an internal shell-rotating design and is equipped with a normally closed brake. The brake is hydraulically controlled. When the cable is retracted or released, the hydraulic oil enters the brake to open the brake, and the hydraulic motor drives the cylinder to rotate through the reducer. The winch stops under any conditions, and the normally closed brake ensures the cylinder braking to keep the ROV and CTD in the stopped position.

[0032] The umbilical winch consists of an ROV umbilical winch 3.1 and a CTD umbilical winch 3.2. The umbilical winch is mainly used to retract and release the umbilical cable. The ROV umbilical winch 3.1 and the CTD umbilical winch 3.2 are respectively arranged on one side of the ROV lifting winch 2.1 and the CTD lifting winch 2.2 for retracting and releasing the umbilical cable. The umbilical winch mainly consists of a drum, a frame, a flange shaft, an umbilical cable, and an electric slip ring. The umbilical winch shares the power of the lifting winch through a transmission gear pair. The umbilical cable drum uses the same rope groove parameters as the lifting winch to ensure synchronous retraction and release with the lifting winch.

[0033] Track 4 is arranged on the port and starboard side walls of the moon pool, of which the port side is ROV track 4.1 and the starboard side is CTD track 4.2. ROV track 4.1 consists of upper fixed track 4.1.1, lower fixed track 4.1.2, wheel 4.1.3, telescopic track 4.1.4, and telescopic cylinder 4.1.5. The structure of CTD track 4.2 is similar to that of ROV track 4.2. ROV track 4.1 adopts H-shaped steel design, and the fixed track is divided into upper and lower sections. The upper fixed track 4.1.1 is arranged above the main deck, and the lower fixed track 4.1.2 is arranged inside the moon pool. The fixed track cannot be arranged in the middle due to the moon pool hatch. Telescopic track 4.1.4 is mainly arranged on the upper fixed track 4.1.1. The telescopic track 4.1.4 and wheel 4.1.3 can be raised and lowered in the slot of the upper fixed track 4.1.1 under the action of telescopic cylinder 4.1.5. The lower end of the telescopic rail 4.1.4 and the upper end of the lower fixed rail 4.1.2 adopt a docking groove design to ensure the rail docking accuracy and load-bearing capacity.

[0034] The tower lock 5 is arranged at the bottom of the working platform for the storage and maintenance of the ROV pulley and the ROV guide joint. The tower lock 5 is mainly composed of an upper tower and a lower tower. The upper part of the upper tower is connected to the bottom of the working platform, and the lower part is connected to the lower tower. The lower tower is arranged with a universal locking mechanism, which can automatically lock and actively unlock. The tower lock is also equipped with a limit switch to indicate the working status of the lock tongue and control the ROV lifting winch to lift in place.

[0035] The pulley is arranged on the track and consists of an ROV pulley 6.1 and a CTD pulley 6.2. The ROV pulley 6.1 consists of a pulley frame 6.1.1, a wheel 6.1.2, and a guide pulley 6.1.3, and the CTD pulley 6.2 consists of a pulley frame 6.2.1, a wheel 6.2.2, a guide pulley 6.2.3, a locking mechanism 6.2.4, a damper 6.2.5, and a tilting cylinder 6.2.6. The pulley frame is welded into a frame structure by hollow square steel. The pulley frame is equipped with wheels on the side, a lifting cable guide pulley is installed on the top, and a joint is designed in the middle of the frame for docking the ROV guide joint and the CTD water sampler. The wheels are divided into guide wheels and running wheels. The guide wheels are arranged on one side of the track for guiding and carrying in the direction of the length of the ship, and the running wheels are arranged on both sides of the track for guiding and carrying in the direction of the width of the ship. The damper 6.2.5 adopts a spring type, and there is a guide cylinder in the middle of the spring for telescopic guidance. The damper 6.2.5 has a buffer ring at the bottom, and a rubber buffer pad is used at the bottom of the buffer ring. The locking mechanism 6.2.4 adopts an action oil cylinder and a return spring design to achieve the locking and release of the CTD water sampler. The expansion and contraction of the turning oil cylinder 6.2.6 is used to change the working state and storage state of the pulley, reducing the storage space occupied by the pulley.

[0036] The guide joint 7 is used for docking and release with ROV on deck or underwater. The main structure is the main load-bearing and supporting structure of the guide joint. Two lifting ears are arranged on the upper part for lifting and lowering. The middle top is a load-bearing head structure closed with the tower lock 5.

[0037] The bracket includes an ROV bracket 8.1 and a CTD bracket 8.2. The ROV bracket 8.1 is composed of an ROV maintenance bracket 8.1.1 and an ROV limit bracket 8.1.2. The CTD bracket 8.2 is similar in structure to the ROV bracket 8.1 and is divided into a CTD maintenance bracket 8.2.1 and a CTD limit bracket 8.2.2. The maintenance bracket is installed on the bulkhead of the upper deck of the moon pool, and is mainly composed of a bracket, a flip cylinder, a bracket and a pin. When the system is working normally, the maintenance bracket is in a retracted state. When maintenance or storage operations are required, the maintenance bracket needs to be turned out to support the ROV pulley and the CTD pulley. The limit switch of the bracket working position is used for safety interlocking and status indication. The limit brackets are all installed at the bottom of the moon pool, mainly used to limit the extreme positions of the ROV pulley and the CTD pulley, and provide fixed support for the bracket.

[0038] The underwater HPU includes ROV underwater HPU9.1 and CTD underwater HPU9.2. The underwater HPU mainly consists of a pump group, a valve group, an oil tank, a compensator, etc. The ROV underwater HPU9.1 is used to drive the mechanism on the guide joint 7. The CTD underwater HPU9.2 is used to drive the mechanism on the CTD pulley 6.2.

[0039] Key technical points of the present invention:

[0040] (1) This multi-purpose polar moon pool deployment and recovery system integrates the functions of deploying ROVs, CTDs, and concealed scientific research equipment. The space planning is reasonable and meets the requirements for the deployment and recovery of various scientific research equipment.

[0041] (2) The hoisting winch and umbilical cable winch are arranged on the working platform, and the working platform is arranged on the hull frame at the top of the moon pool cabin;

[0042] (3) The ROV track is arranged on the bulkhead on one side of the moon pool. The ROV trolley is installed on the track through rollers and moves up and down in the track;

[0043] (4) The CTD track is arranged on the bulkhead on one side of the moon pool. The CTD pulley is installed on the track through rollers and moves up and down in the track;

[0044] (5) The ROV guide joint is connected to the ROV lifting winch through two cables;

[0045] (6) During ROV or concealed deployment and recovery operations, the CTD pulley's tilting cylinder extends to put the pulley in a vertical storage state. At the same time, the CTD lifting winch can place the CTD pulley on the CTD maintenance bracket.

[0046] (7) During the CTD deployment and recovery operation, the ROV pulley and ROV guide joint rise to the bottom of the working platform and dock with the tower lock. The tilting cylinder of the CTD pulley retracts to put the pulley in a horizontal working state.

[0047] (8) When the ROV is in deployment and recovery mode, see Figure 7 , the hoisting cable on the ROV hoisting winch is connected to the guide joint through the ROV pulley cable guide pulley, and the ROV pulley is rigidly connected to the ROV guide joint. During the deployment operation, the ROV hoisting winch lifts the ROV pulley and ROV guide joint assembly to a certain distance above the ROV and stops and maintains the position. The optical cable winch lifts the ROV and the ROV guide joint automatically docks and locks. At this time, the ROV, ROV guide joint, and ROV pulley are combined together. The ROV hoisting winch lowers the assembly to the ROV limit bracket position at the bottom of the cabin. At this time, the ROV pulley is placed on the ROV limit bracket. The ROV guide joint and the ROV assembly continue to be lowered to the bottom of the cabin at a certain distance to maintain the position. The optical cable winch lifts the ROV. Under the drive of the underwater HPU, the ROV and the ROV guide joint are actively unlocked and released. The ROV guide joint is recovered under the action of the ROV hoisting winch and is solved with the ROV pulley at the bottom of the cabin. The ROV continues to be lowered under the control of the optical cable winch. During the recovery operation, the ROV lifting winch lowers the ROV guide joint to a certain distance below the cabin bottom. At this time, the optical cable winch recovers the ROV to the bottom of the ROV guide joint until the ROV is automatically docked into the ROV guide joint. The ROV and ROV guide joint assembly continues to be lifted to the cabin bottom and docked with the ROV pulley under the action of the ROV lifting winch, realizing the rigid suspension of the ROV and the ROV guide joint. The ROV lifting winch continues to lift the ROV, the ROV guide joint, and the ROV pulley assembly to a certain distance above the deck and stop. The optical cable winch lifts the ROV to release the ROV and the ROV guide joint, completing the recovery operation.

[0048] (9) In the concealed deployment and recovery operation mode, the ROV pulley is first placed on the ROV maintenance bracket, the ROV guide joint is released from the ROV lifting winch cable, the ROV lifting cable is connected to the concealed load frame, the ROV lifting winch lifts the concealed load frame and the ROV pulley to form a combination, the ROV maintenance bracket is retracted, the combination is lowered to the limit bracket on the bottom of the cabin, the ROV pulley is placed on the limit bracket on the bottom of the cabin, the concealed load frame is separated from the pulley and continues to be lowered to a certain distance on the bottom of the cabin, the concealed load is released from the frame, and the frame is recovered to the bottom of the cabin by the ROV lifting winch and docked with the ROV pulley to complete the deployment operation. During the recovery operation, the ROV lifting winch lowers the concealed load frame to a certain distance from the bottom of the cabin, and the concealed load and the frame are automatically docked and locked. The concealed load frame is recovered to the bottom of the cabin by the ROV lifting winch and docked with the ROV pulley to achieve rigid suspension of the concealed load. The load frame and the ROV pulley are continuously lifted to the deck by the ROV lifting winch to complete the recovery operation.

[0049] (10) In CTD deployment and recovery operation mode, see Figure 8 , the CTD lifting winch is connected to the CTD pulley through a cable, the CTD lifting winch lowers the CTD pulley to a certain distance above the CTD water sampler, the CTD scientific research winch lifts the CTD water sampler and automatically docks and locks with the CTD pulley, the CTD pulley and CTD water sampler assembly is lowered to the CTD limit bracket on the bottom of the cabin under the action of the CTD lifting winch, the CTD scientific research winch lifts the CTD water sampler to actively release it from the CTD pulley, and continues to lower the CTD water sampler to complete the deployment operation. When recovering, the CTD scientific research winch lifts the CTD water sampler to the bottom of the cabin and automatically docks and locks with the CTD pulley, the assembly is lifted to the deck under the action of the CTD lifting winch, the CTD scientific research winch is operated to actively release the CTD water sampler from the CTD pulley, and it is lowered to the deck to complete the recovery operation.

[0050] (11) The connection between the pulley and the ROV and CTD can be considered as a rigid connection, which can achieve the effect of preventing swing and ensure the stability during docking and retracting and deploying the ROV and CTD.

[0051] (12) The configuration of the tilting cylinder in the CTD pulley makes the CTD pulley easy to store and makes efficient use of limited space.

[0052] (13) The configuration of limit switches and limit brackets can effectively ensure the safety of retraction and extension operations.

Claims

1. A multi-purpose polar moon pool retracting and launching system, used to support the retracting and launching operations of unmanned submersibles (ROVs), CTD water samplers, and AUVs, characterized by: It includes a working platform, a lifting winch, an umbilical cable winch, a track, a tower lock, a pulley, a guide joint, a bracket, and an underwater HPU. The working platform is arranged on the hull frame at the top of the moon pool cabin; the lifting winch and the umbilical cable winch are arranged on the working platform, the ROV track is arranged on the bulkhead on one side of the moon pool, the ROV pulley is installed on the ROV track through rollers and moves up and down in the ROV track; the CTD track is arranged on the bulkhead on one side of the moon pool, the CTD pulley is installed on the CTD track through rollers and moves up and down in the CTD track; the guide joint is connected to the ROV lifting winch through two cables; it is used for docking and release with the ROV on the deck or underwater; the CTD pulley is equipped with a flip cylinder, and the working state and storage state of the ROV pulley are changed by the extension and retraction of the flip cylinder; the tower lock is arranged at the lower part of the working platform, and is used for the storage and maintenance of the ROV pulley and the ROV guide joint; the underwater HPU is used to drive the mechanism action on the guide joint and the mechanism action on the CTD pulley respectively.

2. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The working platform is welded from steel sections into a frame structure; grid platforms are arranged inside and around the working platform for operation and maintenance.

3. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The lifting winch includes ROV lifting winch and CTD lifting winch. The ROV lifting winch is used to lift the ROV pulley and guide joint, and the CTD lifting winch is used to lift the CTD pulley. The lifting winch is composed of a spiral drum, a frame, a flange shaft, a reducer, a hydraulic motor, a lifting cable and accessories, and a force and speed measuring device. The lifting winch is driven by a hydraulic motor, and the reducer adopts an internal shell-rotating structure with a normally closed brake, and the normally closed brake is hydraulically controlled.

4. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The umbilical cable winch includes an ROV umbilical cable winch and a CTD umbilical cable winch. The ROV umbilical cable winch and the CTD umbilical cable winch are respectively arranged on one side of the ROV lifting winch and the CTD lifting winch 2 for retracting and releasing the umbilical cable. The umbilical cable winch is composed of a drum, a frame, a flange shaft, an umbilical cable, and an electric slip ring. The umbilical cable winch shares the power of the lifting winch through a transmission gear pair. The drum adopts the same rope groove parameters as the lifting winch to ensure synchronous retraction and release with the lifting winch.

5. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The track consists of an upper fixed track, a lower fixed track, wheels, a telescopic track, and a telescopic cylinder. The ROV track is designed with H-shaped steel. The fixed track is divided into two sections, the upper fixed track is arranged above the main deck, and the lower fixed track is arranged inside the moon pool. The fixed track cannot be arranged in the middle due to the moon pool hatch cover; the telescopic track is mainly arranged on the upper fixed track, and the telescopic track and wheels rise and fall in the upper fixed track groove under the action of the telescopic cylinder; the lower end of the telescopic track and the upper end of the lower fixed track adopt a docking groove structure to ensure the track docking accuracy and load-bearing capacity.

6. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The tower lock consists of an upper tower frame and a lower tower frame. The upper part of the upper tower frame is connected to the bottom of the working platform, and the lower part is connected to the lower tower frame. The lower tower frame is equipped with a universal locking mechanism that can automatically lock and actively unlock. The tower lock is also equipped with a limit switch to indicate the working status of the lock tongue and control the ROV lifting winch to lift into place.

7. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The pulleys include ROV pulleys and CTD pulleys, wherein the ROV pulley is composed of a pulley frame, wheels, and guide pulleys, and the CTD pulley is composed of a pulley frame, wheels, guide pulleys, locking mechanisms, dampers, and flip cylinders; the pulley frame is welded from hollow square steel into a frame structure, wheels are installed on the sides of the pulley frame, a lifting cable guide pulley is installed on the top, and a joint is designed in the middle of the frame for docking the ROV guide joint and the CTD water sampler; the wheels are divided into guide wheels and running wheels, the guide wheels are arranged on one side of the track for guiding and bearing in the direction of the length of the ship, and the running wheels are arranged on both sides of the track for guiding and bearing in the direction of the width of the ship; the damper adopts a spring type, a guide cylinder is provided in the middle of the spring for telescopic guidance, and a buffer ring is provided at the bottom of the damper; a rubber buffer pad is adopted at the bottom of the buffer ring; the locking mechanism adopts an action cylinder and a reset spring, which can realize the locking and release of the CTD water sampler; the flip cylinder changes the working state and storage state of the pulley by telescoping, thereby reducing the storage space occupied by the pulley.

8. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: A number of lifting eyes are arranged on the upper part of the guide joint for lifting and lowering, and the middle top is a load-bearing head structure that is closed with the tower lock.

9. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The bracket includes an ROV bracket and a CTD bracket, wherein the ROV bracket is composed of an ROV maintenance bracket and an ROV limit bracket, and the CTD bracket has a similar structure to the ROV bracket and is divided into a CTD maintenance bracket and a CTD limit bracket. The maintenance bracket is installed on the bulkhead of the upper deck of the moon pool and is composed of a bracket, a flip cylinder, a bracket and a pin.

10. The multi-purpose polar moon pool retracting and releasing system according to claim 1, characterized in that: The underwater HPU includes ROV underwater HPU and CTD underwater HPU. The underwater HPU consists of a pump group, a valve group, an oil tank, and a compensator.

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