A multipurpose polar region moonpool launch and recovery system

Abstract

The present application relates to a kind of multipurpose polar region moon pool launch and recovery system, working platform is arranged on the moon pool cabin top hull frame;Lifting winch, umbilical cable winch is arranged on the working platform, ROV track is arranged on the moon pool one side bulkhead, ROV trolley is installed on ROV track by roller and moves up and down in ROV track;CTD track is arranged on the moon pool one side bulkhead, CTD trolley is installed on CTD track by roller and moves up and down in CTD track;Guide connector is connected with ROV lifting winch by two cables;For deck or underwater and ROV interface and release;CTD trolley is equipped with turnover oil cylinder, and the working state and storage state of ROV trolley are changed by the extension and retraction of turnover oil cylinder;Tower lock is arranged in the lower part of working platform, for the storage maintenance of ROV trolley and ROV guide connector;Underwater HPU is used to drive the mechanism action on guide connector and the mechanism action on CTD trolley respectively.

Description

Technical Field

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

[0002] Polar research vessels are crucial for deep-sea exploration. They must carry a variety of exploration and underwater equipment when sailing, which takes up considerable deck space and compromises operational safety. The Moonpool Deployment and Recovery System, installed on deep-sea (polar) submersible and integrated operations motherships, supports the deployment and recovery of scientific research equipment, including unmanned remotely operated vehicles (ROVs) and CTD water samplers, while also accommodating other scientific research operations, meeting the demands of deep-sea and polar research.

[0003] Currently, the most widely used methods for deploying and retrieving submersibles include A-frame deployment and recovery, dedicated single-arm crane deployment and recovery, and slideway deployment and recovery. To enable deployment and retrieving submersibles in high sea conditions, a moonpool system is employed, as described in CN112173012. For example, patent CN221340957 describes a moonpool design for concealed deployment of underwater equipment. Integrating unmanned remotely operated vehicles (ROVs), CTD water samplers, and AUVs onto a single platform significantly increases operational efficiency. When designing a moonpool deployment and retrieving system, operational safety, stability, and operability are inevitably important considerations. Summary of the Invention

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

[0005] To achieve the above objectives, the technical solution of the present invention is: a multi-purpose polar moonpool deployment and retraction system for supporting the deployment and retraction of unmanned submersibles (ROVs), CTD water samplers, and AUVs, comprising a working platform, a hoisting 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 moonpool cabin; the hoisting 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 moonpool; the ROV pulley is mounted on the ROV track via rollers and moves up and down within the ROV track; C The TD track is arranged on the bulkhead on one side of the moonpool. The CTD block is installed on the CTD track via rollers and moves up and down within the CTD track. The guide head is connected to the ROV lifting winch via two cables. It is used for docking and detaching with the ROV on deck or underwater. The CTD block is equipped with a tilting cylinder, which changes the working state and storage state of the ROV block by extending and retracting the tilting cylinder. The tower lock is arranged at the bottom of the work platform and is used for the storage and maintenance of the ROV block and ROV guide head. The underwater HPU is used to drive the mechanisms on the guide head and the CTD block respectively.

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

[0007] Furthermore, the hoisting winch includes an ROV hoisting winch and a CTD hoisting winch. The ROV hoisting winch is used to lift the ROV pulley and the guide joint, and the CTD hoisting winch is used to lift the CTD pulley. The hoisting winch is composed of a spiral drum, a frame, a flange shaft, a reducer, a hydraulic motor, a hoisting cable and accessories, and a force and speed measuring device. The hoisting winch is driven by a hydraulic motor, and the reducer adopts an internal shell-rotating 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. The ROV umbilical cable winch and the CTD umbilical cable winch are respectively arranged on one side of the ROV hoisting winch and the CTD hoisting 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 hoisting winch through a transmission gear pair. The drum adopts the same rope groove parameters as the hoisting winch to ensure synchronous retraction and release with the hoisting 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 adopts an H-shaped steel design, and 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; 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.

[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 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.

[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 tilting cylinder; the pulley frame is welded into a frame structure by hollow square steel, the pulley frame is equipped with wheels on the side, and a lifting cable guide pulley is equipped on the top, and the middle of the frame is designed to be a docking joint 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 ship length, and the running wheels are arranged on both sides of the track for guiding and bearing in the direction of the ship width; the damper adopts a spring type, and there is a guide cylinder in the middle of the spring for telescopic guidance, and the lower part of the damper is a buffer ring; the bottom of the buffer ring adopts a rubber buffer pad; the locking mechanism adopts an actuating cylinder and a reset spring, which can realize the locking and release of the CTD water sampler; the tilting 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 lugs 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. The ROV bracket consists of an ROV maintenance bracket and an ROV limit bracket. 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 upper deck bulkhead of the moon pool and consists of a bracket, a tilting cylinder, a bracket and a pin.

[0014] Furthermore, the underwater HPU includes the ROV underwater HPU and the 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 about by the technical solution of the present invention are as follows:

[0016] 1) This multi-purpose polar moonpool deployment system integrates the functions of deploying ROVs, CTDs, and concealed scientific research equipment on a common platform, rationally utilizing limited space and increasing 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 prevent swings 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 retraction and extension operation. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 3 This is a schematic diagram of the upper structure of the ROV orbit moonpool of the multi-purpose polar region moonpool retraction and deployment system;

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

[0024] Figure 5 This is a schematic diagram of the CTD pulley components of the multi-purpose polar moon pool retraction and deployment system;

[0025] Figure 6 This is a schematic diagram of the storage status of the multi-purpose polar region moon pool retraction and deployment system;

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

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

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

[0029] like Figures 1 to 6As shown in the figure, the present invention presents a multi-purpose polar moonpool deployment and recovery system, designed to support the deployment and recovery of unmanned submersibles (ROVs), CTD water samplers, and AUVs. The CTD and ROV armored cables are connected to the submersible via guide pulleys. The system primarily comprises a work platform 1, a hoisting 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] Work platform 1 is the primary load-bearing structure, primarily constructed from welded steel sections into a frame. It rests on the longitudinal beams at the top of the moonpool compartment. Work platform 1 houses the ROV hoist winch 2.1, ROV umbilical winch 3.1, CTD hoist winch 2.2, and CTD umbilical winch 3.2. A tower lock 5 is located beneath work platform 1. Grid platforms are located within and around work platform 1 for operation and maintenance.

[0031] The hoisting winch consists of the ROV hoisting winch 2.1 and the CTD hoisting winch 2.2. The ROV hoisting winch 2.1 is used to hoist the ROV pulley 6.1 and guide joint 7, while the CTD hoisting winch 2.2 is used to hoist the CTD pulley 6.2. The hoisting winch consists of a spiral drum, a frame, a flange shaft, a reducer (with brake), a hydraulic motor, a hoisting cable and accessories, and force and speed measuring devices. The hoisting 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, hydraulic oil enters the brake to open it, and the hydraulic motor drives the drum to rotate through the reducer. When the winch stops under any conditions, the normally closed brake ensures that the drum is braked, keeping the ROV and CTD in the stopped position.

[0032] The umbilical winches consist of the ROV umbilical winch 3.1 and the CTD umbilical winch 3.2. These winches are primarily used for retracting and deploying the umbilical cable. They are located on either side of the ROV hoist winch 2.1 and the CTD hoist winch 2.2, respectively, to retract and deploy the umbilical cable. The umbilical winches primarily consist of a drum, frame, flange shaft, umbilical cable, and electric slip rings. The umbilical winches share power with the hoist winch via a transmission gear pair. The umbilical drum uses the same rope groove parameters as the hoist winch, ensuring synchronous retraction and deployment.

[0033] Tracks 4 are located on the port and starboard sides of the moonpool. The port side houses the ROV track 4.1, while the starboard side houses the CTD track 4.2. ROV track 4.1 consists of an upper fixed track 4.1.1, a lower fixed track 4.1.2, wheels 4.1.3, telescopic tracks 4.1.4, and telescopic cylinders 4.1.5. The CTD track 4.2 has a similar structure to ROV track 4.2. ROV track 4.1 utilizes an H-shaped steel design, with the fixed track divided into two sections: the upper fixed track 4.1.1, located above the main deck, and the lower fixed track 4.1.2, located within the moonpool. The moonpool hatch prevents the placement of a fixed track in the middle. Telescopic track 4.1.4 is primarily located on the upper fixed track 4.1.1. Telescopic track 4.1.4 and wheels 4.1.3 are driven by telescopic cylinders 4.1.5 to raise and lower the track within the slot of the upper fixed track 4.1.1. The lower end of the telescopic track 4.1.4 and the upper end of the lower fixed track 4.1.2 adopt a docking groove design to ensure the track docking accuracy and load-bearing capacity.

[0034] The tower lock 5, located below the work platform, is used for storage and maintenance of the ROV trolley and ROV guide head. It primarily consists of an upper tower and a lower tower. The upper tower is connected to the bottom of the work platform, while the lower tower is connected to the lower tower. The lower tower is equipped with a universal locking mechanism that allows for automatic locking and active unlocking. The tower lock is also equipped with a limit switch to indicate the lock tongue's operating status and control the ROV hoist winch's position.

[0035] The pulleys are mounted on the track and consist 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, wheels 6.1.2, and guide pulleys 6.1.3. The CTD pulley 6.2 consists of a pulley frame 6.2.1, wheels 6.2.2, guide pulleys 6.2.3, locking mechanisms 6.2.4, dampers 6.2.5, and tilting cylinders 6.2.6. The pulley frame is welded from hollow square steel into a frame structure. Wheels are mounted on the sides of the pulley frame, and a hoist cable guide pulley is mounted on the top. A docking 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 located on one side of the track for guidance and load-bearing in the ship's length direction, while the running wheels are located on both sides of the track for guidance and load-bearing in the ship's width direction. The damper 6.2.5 is a spring-type spring with a guide cylinder in the middle for telescopic guidance. The damper 6.2.5 has a buffer ring at its base, which is cushioned by a rubber cushion. The locking mechanism 6.2.4 utilizes an actuating cylinder and a return spring to lock and release the CTD water sampler. The retractable cylinder 6.2.6 allows the pulley to change between its operating and storage states, reducing the storage space occupied by the pulley.

[0036] The guide joint 7 is used for docking and disconnecting with the ROV on the 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 the 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 consists of an ROV maintenance bracket 8.1.1 and an ROV limit bracket 8.1.2. The CTD bracket 8.2 has a similar 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 mainly consists of a bracket, a flip cylinder, a bracket and a pin. When the system is operating normally, the maintenance bracket is in a retracted state. When maintenance or storage operations are required, the maintenance bracket needs to be flipped 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 subsea HPUs include the ROV subsea HPU 9.1 and the CTD subsea HPU 9.2. They primarily consist of a pump assembly, valve assembly, fuel tank, compensator, and other components. The ROV subsea HPU 9.1 drives the mechanisms on the guide joint 7. The CTD subsea HPU 9.2 drives the mechanisms on the CTD pulley 6.2.

[0039] Key technical points of the present invention:

[0040] (1) This multi-purpose polar moon pool deployment and retraction system integrates the functions of deploying ROVs, CTDs, and concealed scientific research equipment. The space planning is reasonable and meets the requirements of deploying and recovering a variety of 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 on 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 pulley is installed on the track through rollers and moves up and down within 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 hoisting 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, making the pulley in a horizontal working state.

[0047] (8) When ROV is deployed and recovered, see Figure 7 The hoisting cable on the ROV hoist winch is connected to the guide joint via the ROV pulley's cable guide pulley. The ROV pulley is rigidly connected to the ROV guide joint. During deployment operations, the ROV hoist winch raises the ROV pulley and ROV guide joint assembly to a certain distance above the ROV, stopping and maintaining its position. The optical cable winch raises the ROV, automatically docking and locking it with the ROV guide joint. The ROV, ROV guide joint, and ROV pulley are now combined. The ROV hoist winch lowers the assembly to the ROV limit bracket on the cabin floor. The ROV pulley rests on the ROV limit bracket. The ROV guide joint and ROV assembly continue to be lowered to a certain distance below the cabin floor, maintaining their position. The optical cable winch raises the ROV. Driven by the underwater HPU, the ROV and ROV guide joint are automatically unlocked and released. The ROV guide joint is recovered by the ROV hoist winch and aligned with the ROV pulley on the cabin floor. The ROV continues lowering operations under the control of the optical cable winch. During the recovery operation, the ROV hoisting 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 below the ROV guide joint until the ROV automatically docks into the ROV guide joint. Under the action of the ROV hoisting winch, the ROV and ROV guide joint assembly continues to be lifted to the cabin bottom and docked with the ROV pulley to achieve rigid suspension of the ROV and ROV guide joint. The ROV hoisting winch continues to lift the ROV, ROV guide joint, and ROV pulley assembly to a certain distance above the deck and stop. The optical cable winch lifts the ROV to release the ROV and 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 cabin bottom limit bracket, the ROV pulley is placed on the cabin bottom limit bracket, the concealed load frame is separated from the pulley and continues to be lowered to a certain distance from the cabin bottom, the concealed load is released from the frame, and the frame is recovered to the cabin bottom by the ROV lifting winch and docked with the ROV pulley to complete the deployment operation. During the recovery operation, the ROV hoisting winch lowers the concealed load frame to a certain distance from the cabin bottom, and the concealed load and the frame are automatically docked and locked. The concealed load frame is recovered to the cabin bottom by the ROV hoisting winch and docked with the ROV pulley to achieve rigid suspension of the concealed load. The load frame and ROV pulley are continued to be lifted to the deck by the ROV hoisting winch to complete the recovery operation.

[0049] (10) In CTD deployment and recovery 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 it 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 and actively releases it from the CTD pulley, and continues to lower the CTD water sampler to complete the deployment operation. When the recovery operation is performed, the CTD scientific research winch lifts the CTD water sampler to the bottom of the cabin and automatically docks and locks it 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 lower it to the deck to complete the recovery operation.

[0050] (11) The connection between the pulley and the ROV and CTD can be considered a rigid connection, which can achieve the effect of preventing swing and ensure the stability during docking and retracting 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 moonpool deployment and retraction system for supporting the deployment and retraction of unmanned underwater vehicles (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 tilting cylinder, which changes the working state and storage state of the ROV pulley by extending and retracting the tilting cylinder; the tower lock is arranged at the bottom of the working platform for the storage and maintenance of the ROV pulley and the ROV guide joint; the underwater HPU is used to drive the machines on the guide joint The umbilical cable winch includes the ROV umbilical cable winch and the CTD umbilical cable winch, which are respectively arranged on one side of the ROV lifting winch and the one side of the CTD lifting winch; 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; the tower lock is 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, and 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 lifting of the ROV lifting winch into place; the pulley includes an ROV pulley and a CTD pulley, wherein the ROV pulley is composed of a pulley frame, wheels, and guide pulleys, The CTD pulley consists of a pulley frame, wheels, guide pulleys, locking mechanism, damper, and tilting cylinder; the pulley frame is welded from hollow square steel into a frame structure, with wheels installed on the sides of the pulley frame and a lifting cable guide pulley installed on the top. The middle of the frame is designed as a docking joint for docking ROV guide joints and CTD water samplers; 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 ship's length, and the running wheels are arranged on both sides of the track for guiding and carrying in the direction of the ship's width; the damper adopts a spring type, with a guide cylinder in the middle of the spring for telescopic guidance, and a buffer ring at the bottom of the damper; a rubber buffer pad is used at the bottom of the buffer ring; the locking mechanism adopts an actuating cylinder and a reset spring, which can realize the locking and release of the CTD water sampler; the tilting cylinder changes the working state and storage state of the pulley by telescoping, reducing the storage space occupied by the pulley.

2. The multi-purpose polar moon pool retraction and deployment 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 retraction and deployment system according to claim 1, characterized in that: The hoisting winch includes ROV hoisting winch and CTD hoisting winch. The ROV hoisting winch is used to hoist the ROV pulley and guide joint, and the CTD hoisting winch is used to hoist the CTD pulley. The hoisting winch consists of a spiral drum, a frame, a flange shaft, a reducer, a hydraulic motor, a hoisting cable and accessories, and a force and speed measuring device. The hoisting winch is driven by a hydraulic motor. The reducer adopts a built-in shell-rotor structure and is equipped with a normally closed brake. The normally closed brake is hydraulically controlled.

4. The multi-purpose polar moon pool retraction and deployment 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. The telescopic track is arranged on the upper fixed track. 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.

5. The multi-purpose polar moon pool retraction and deployment system according to claim 1, characterized in that: Several lifting lugs 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.

6. The multi-purpose polar moon pool retraction and deployment system according to claim 1, characterized in that: The bracket includes an ROV bracket and a CTD bracket. The ROV bracket consists of an ROV maintenance bracket and an ROV limit bracket. The CTD bracket is divided into a CTD maintenance bracket and a CTD limit bracket. The maintenance bracket is installed on the upper deck bulkhead of the moon pool and consists of a bracket, a tilting cylinder, a bracket and a pin.

7. The multi-purpose polar moon pool retraction and deployment 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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