Underwater vehicle mast hydraulic drive system

Abstract

This invention relates to the field of underwater hydraulic drive technology and discloses a hydraulic drive system for raising and lowering the mast of an underwater vehicle. The system includes a hydraulic power station, a compensator assembly, a control valve box, a multi-stage raising cylinder, and a tilting hydraulic cylinder. The hydraulic power station provides a power source, enables high and low flow switching, and controls the multi-stage raising cylinder. The compensator assembly is connected to the hydraulic power station and is used for pressure and volume compensation. The control valve box is connected to the hydraulic power station and controls the tilting hydraulic cylinder. The multi-stage raising cylinder and the tilting hydraulic cylinder respectively control the mast raising and lowering actions. This invention, through the modular arrangement of the hydraulic power station, compensator assembly, control valve box, multi-stage raising cylinder, and tilting hydraulic cylinder, facilitates the overall layout of the underwater vehicle. The overall structure is simple, occupies a small volume, provides sufficient vertical lifting height, and has good environmental adaptability, thus benefiting the overall layout of the underwater vehicle.

Description

Technical Field

[0001] This invention relates to the field of underwater hydraulic drive technology, and more specifically, to a hydraulic drive system for raising and lowering the mast of an underwater vehicle. Background Technology

[0002] With the development of underwater technology, underwater vehicles are widely used in marine scientific research and surveys, marine resource development, maritime search and rescue and salvage, and military reconnaissance. When performing communication and reconnaissance missions, underwater vehicles need to extend their communication and reconnaissance masts above the water to a certain height. Due to the large number of masts and the limitations imposed by the space layout and weight of the vehicle, the masts are raised and lowered using both tilting and vertical lifting methods.

[0003] There are generally two drive methods for mast lifting: electric and hydraulic. Electric systems can be used for tilting and lifting, but their complex transmission structure and large size make them unsuitable for vertical lifting. Hydraulic systems offer unique advantages for both tilting and vertical mast lifting: they have a high power-to-weight ratio, can generate significant force or torque, offer good system speed and smooth transmission, and are easy to implement with speed adjustment, hydraulic locking, and overload protection. Therefore, they are more suitable for this type of work.

[0004] Existing mast lifting hydraulic drive systems are mainly used on submarines, but due to their large structural size and the fact that the hydraulic system is located inside the cabin and is not affected by the seawater environment, they are not suitable for underwater vehicles with limited dimensions. Summary of the Invention

[0005] The purpose of this invention is to address the technical problems existing in the prior art by providing a hydraulic drive system for raising and lowering the mast of an underwater vehicle. This system has a simple overall structure, occupies a small space, has sufficient vertical lifting height, and is highly adaptable to various environments, which is beneficial to the overall layout of the underwater vehicle.

[0006] To address the problems mentioned above, the technical solution adopted by this invention is as follows:

[0007] This invention provides a hydraulic drive system for raising and lowering the mast of an underwater vehicle, comprising a hydraulic power station, a compensator assembly, a control valve box, a multi-stage raising cylinder, and a tilting hydraulic cylinder. The hydraulic power station provides a power source for switching between high and low flow rates and controls the multi-stage raising cylinder. The compensator assembly is connected to the hydraulic power station and is used for pressure and volume compensation. The control valve box is connected to the hydraulic power station and controls the tilting hydraulic cylinder. The multi-stage raising cylinder and the tilting hydraulic cylinder respectively control the mast raising and lowering and tilting actions.

[0008] Furthermore, the hydraulic power station includes a front cover, a rear cover plate, a housing, a double gear pump, a pump outlet valve block, a solenoid switch valve, a conversion joint, a screw plug, and a watertight motor;

[0009] The housing has a front cover and a rear cover at its two ends. A double gear pump is installed inside the housing. A watertight motor is mounted on the front cover and connected to the double gear pump. A pump outlet valve block is installed on the inner side of the double gear pump. An oil passage is formed on the pump outlet valve block, and an electromagnetic switch valve and a plug are installed at both ends of the oil passage. A conversion joint is installed on the pump outlet valve block and the double gear pump, penetrating the opposite sidewalls. The conversion joint communicates with the oil passage and is connected to the inner wall of the housing.

[0010] Furthermore, a one-way valve is provided on the oil passage between the adapter and the electromagnetic switch valve and the plug; a first adapter, a high-pressure filter, a cartridge overflow valve and a watertight connector are respectively provided on the front end cover and on the outside of the housing.

[0011] Furthermore, a first one-way throttle valve and a two-way hydraulic lock are respectively provided on the front end cover and on the outer and inner sides of the housing, and an electromagnetic reversing valve is also provided on the inner side of the housing.

[0012] Furthermore, the compensator assembly includes a compensator housing, a compensating spring, a guide cylinder, a piston, a rolling diaphragm, a front cover, and a second adapter; the front cover is provided at the open end of the compensator housing, and a rolling diaphragm is provided between the front cover and the front cover; a cooperating guide cylinder and a piston are provided inside the compensator housing, the piston is connected to the rolling diaphragm, and a compensating spring acting on the piston is provided on the surface of the guide cylinder; a second adapter connected to the hydraulic power station is provided on the front cover.

[0013] Furthermore, pressure test connectors and quick-connect connectors are installed on the front cover of the hydraulic power station and the front cover of the compensator assembly. The pressure test connectors are used for pressure testing and venting, and the quick-connect connectors are used for oil injection.

[0014] Furthermore, the control valve box includes a third quick-connect connector, a watertight connector, a housing, a valve block, a second one-way throttle valve, a two-way hydraulic lock, a solenoid directional valve, and a valve box compensator. The two-way hydraulic lock and the solenoid directional valve are installed inside the housing. One end of the housing is provided with an oil filling interface and a watertight connector is installed thereon, and the other end is provided with a valve box compensator. A valve block is also provided on the outside of the housing, and the third quick-connect connector and the second one-way throttle valve are respectively provided on the valve block.

[0015] Furthermore, the lifting multi-stage cylinder includes a cable sensor, a cylinder barrel, an oil pipe, a piston rod, a piston, and a piston rod assembly; the piston rod and piston are arranged inside the cylinder barrel, and multi-stage piston rod assemblies are arranged in sequence; the cable sensor is built into the bottom of the cylinder barrel and connected to the piston; an oil pipe communicating between the inner cavity and the outside is provided on the surface of the cylinder barrel.

[0016] Furthermore, the pull-wire sensor is installed inside the cylinder via a watertight adapter and a watertight connector; the oil pipe includes a first oil pipe and a second oil pipe connecting the two ends of the cylinder, both of which are connected to the outside via a third adapter.

[0017] Furthermore, the tilting hydraulic cylinder includes a base, piston, piston rod, cylinder barrel, watertight connector, hinge joint, proximity switch, adapter seat, front end cover, spherical bearing and rod end lug;

[0018] The cylinder barrel is provided with a proximity switch on its surface and a sealing adapter is provided. The adapter is also provided with a watertight connector. The cylinder barrel is also provided with a hinge joint on its surface. The inner cavity is provided with a matching piston and piston rod. The two ends are provided with a base and a front end cover, respectively. The end of the piston rod extends out of the front end cover and is provided with a rod end lug. The base and the rod end lug are also provided with spherical bearings.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1) The system provided by this invention is modularly configured with a hydraulic power station, compensator assembly, control valve box, lifting multi-stage cylinder and tilting hydraulic cylinder, and connected and coordinated. The overall structure is simple, small in size and highly modular, which is beneficial to the overall layout of the underwater vehicle. The mast is controlled by the lifting multi-stage cylinder and tilting hydraulic cylinder, which supports two control modes and realizes the lifting and lowering of multiple masts. The compensator assembly is used for volume compensation and pressure compensation, which ensures the large volume compensation requirement for lifting and lowering multiple masts, reduces the weight of the system and improves the adaptability to the underwater environment.

[0021] 2) The hydraulic power station of the present invention can control the working state of the double gear pump, realize the high / low flow switching of the system, adapt to the requirements of simultaneous lifting of single mast and multiple masts, and save system energy consumption; the watertight motor does not require a separate pressure compensator, and can be connected to the internal compensating oil through the channel, which reduces the weight and complexity of the watertight motor.

[0022] 3) In this invention, the cartridge-type relief valve, throttle valve and high-pressure filter in the hydraulic power station and control valve box are all external, which facilitates the adjustment of system pressure and speed, and makes it easy to replace the high-pressure filter;

[0023] 4) The multi-stage lifting cylinder of the present invention is provided with multi-stage piston rods and pistons in the cylinder barrel, and multi-stage piston rod assemblies are provided, which can ensure that the mast can be raised to a high height on a small-diameter aircraft; the piston rod has a long guide length and can withstand a certain radial force; it has the ability to detect the position underwater in real time.

[0024] 5) The interface of the tilting hydraulic cylinder of this invention adopts the form of a spherical bearing, with a small fitting clearance, which is beneficial to controlling the amount of mast sway; a proximity switch is also provided to realize the detection of the starting and ending positions.

[0025] 6) The hydraulic power station, control valve box and compensator assembly of the present invention are respectively provided with quick-connect connectors as oil filling ports and pressure testing connectors as pressure relief and exhaust ports, which facilitates insertion, removal and disassembly. Attached Figure Description

[0026] To more clearly illustrate the solutions in this invention, a brief introduction to the accompanying drawings used in the description of the embodiments will be provided below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort. Wherein:

[0027] Figure 1 This is a schematic diagram of the hydraulic drive system for raising and lowering the mast of the underwater vehicle of the present invention.

[0028] Figure 2 This is a front view of the hydraulic power station in this invention.

[0029] Figure 3 This is a right view of the hydraulic power station in this invention.

[0030] Figure 4 This is a schematic diagram of the compensator assembly in this invention.

[0031] Figure 5 This is a schematic diagram of the control valve assembly in this invention.

[0032] Figure 6 This is a schematic diagram of the lifting multi-stage cylinder in this invention.

[0033] Figure 7 This is a schematic diagram of the tilting hydraulic cylinder in this invention.

[0034] Among them, 1-hydraulic power station, 101-front end cover, 102-first quick-connect coupling, 103-first one-way throttle valve, 104-first adapter, 105-high pressure filter, 106-cartridge type relief valve, 107-pressure test connector, 108-watertight connector, 109-rear cover plate, 110-housing, 111-double gear pump, 112-pump outlet valve block, 113-solenoid switch valve, 114-adapter coupling, 115-check valve, 11 6-Plug, 117-Solenoid directional valve, 118-Two-way hydraulic lock, 119-Coupling, 120-Watertight motor; 2-Compensator assembly, 21-Compensator housing, 22-Compensating spring, 23-Guide cylinder, 24-Piston, 25-Rolling diaphragm, 26-Front cover, 27-Second adapter, 28-Pressure test connector, 29-Second quick-connect connector; 3-Control valve box, 301-Third quick-connect connector, 302-Watertight connector, 303-Oil-filled connector 304-Valve box cover plate, 305-Outer shell, 306-Valve block, 307-Second one-way throttle valve, 308-Two-way hydraulic lock, 309-Solenoid directional valve, 310-Valve box compensator; 4-Lifting multi-stage cylinder, 401-Rear cover plate, 402-Wire sensor, 403-Watertight adapter, 404-Watertight connector, 405-Cylinder barrel, 406-Oil pipe A, 407-First hinge joint, 408-Oil pipe B, 409-Third adapter 410-Fourth-stage piston rod, 411-Fourth-stage piston, 412-Third-stage piston rod assembly, 413-Second-stage piston rod assembly, 414-First-stage piston rod assembly; 5-Tilting hydraulic cylinder, 501-Spherical bearing, 502-Base, 503-Piston, 504-Piston rod, 505-Cylinder barrel, 506-Watertight connector, 507-Second hinge joint, 508-Proximity switch, 509-Adapter, 510-Front end cap, 511-Rod end lug. Detailed Implementation

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0036] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order. In the specification, claims, and accompanying drawings of this invention, when an element is referred to as "fixed to," "mounted to," "disposed of," or "connected to" another element, it may be directly or indirectly located on that other element. For example, when an element is referred to as "connected to" another element, it may be directly or indirectly connected to that other element.

[0037] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] See Figure 1 As shown, the present invention provides a hydraulic drive system for raising and lowering the mast of an underwater vehicle, including a hydraulic power station 1, a compensator assembly 2, a control valve box 3, a multi-stage raising cylinder 4, and a tilting hydraulic cylinder 5; the hydraulic power station 1 provides a power source for switching between high and low flow rates in the system and for controlling the multi-stage raising cylinder 4; the compensator assembly 2 is connected to the hydraulic power station 1 and is used for system pressure compensation and volume compensation; the control valve box 3 is connected to the hydraulic power station 1 and is used to control the tilting hydraulic cylinder 5; the multi-stage raising cylinder 4 and the tilting hydraulic cylinder 5 respectively control the mast raising and lowering and tilting actions.

[0039] Specifically, the compensator assembly 2 can guarantee the large-volume compensation requirements for multi-mast lifting, while also taking into account system oil pressure compensation and watertight motor pressure compensation, effectively improving the adaptability to underwater environments; the hydraulic power station 1, compensator assembly 2 and control valve box 3 are all equipped with quick-connect oil filling ports and venting ports for easy insertion, removal and disassembly; the lifting multi-stage cylinder 4 and tilting hydraulic cylinder 5 have underwater position detection capabilities and convenient electrical connections.

[0040] See Figure 2 and Figure 3 As shown, the hydraulic power station 1 includes a front cover 101, a rear cover plate 109, a housing 110, a double gear pump 111, a pump outlet valve block 112, a solenoid switch valve 113, a conversion joint 114, a screw plug 116, and a watertight motor 120.

[0041] The front cover 101, rear cover plate 109, and housing 110 together form a sealed cylinder containing compensating oil. The front cover 101 and rear cover plate 109 are respectively located at the two ends of the housing 110. A double gear pump 111 is installed inside the housing 110. The watertight motor 120 is mounted on the front cover 101 and connected to the double gear pump 111. A pump outlet valve block 112 is located inside the double gear pump 111. An oil passage is formed on the pump outlet valve block 112, and an electromagnetic switch valve 113 and a screw plug 116 are respectively installed at both ends of the oil passage. A conversion joint 114 penetrating the opposite sidewalls is provided on the pump outlet valve block 112 and the double gear pump 111. The conversion joint 114 communicates with the oil passage and is connected to the inner wall of the housing 110.

[0042] Furthermore, a one-way valve 115 is provided on the oil passage between the conversion joint 114 and the electromagnetic switch valve 113 and the plug 116.

[0043] Specifically, the pump outlet valve block 112 has countersunk through holes at its two opposite ends, and a solenoid switch valve 113 and a plug 116 are respectively installed thereon. The side wall of the pump outlet valve block 112 has a through groove communicating with the countersunk through hole. The side wall of the double gear pump 111 has a mounting through hole corresponding to the position of the through groove. The conversion joint 114 is located within the through groove and the mounting through hole. Two check valves 115 are installed within the countersunk through holes and located on both sides of the conversion joint 114.

[0044] Furthermore, the front cover 101 and located on the outside of the housing 110 are respectively provided with a first quick-connect connector 102, a first adapter 104, a high-pressure filter 105, a cartridge overflow valve 106, a pressure test connector 107, and a watertight connector 108, all of which are in contact with seawater.

[0045] Specifically, the watertight motor 120 is connected to the double gear pump 111 via the coupling 119. The compensating oil inside the sealed cylinder can enter the watertight motor 120 through the channel of the front end cover 101 to compensate for the pressure of the watertight motor 120, thereby reducing the weight and complexity of the watertight motor 120.

[0046] Furthermore, a first one-way throttle valve 103 and a two-way hydraulic lock 118 are respectively provided on the front end cover 101 and located on the outer and inner sides of the housing 110, and an electromagnetic reversing valve 117 is also provided on the inner side of the housing 110.

[0047] Specifically, the double gear pump 111, pump outlet valve block 112, solenoid switch valve 113, conversion joint 114, check valve 115, plug 116, solenoid directional valve 117, and bidirectional hydraulic lock 118 are mounted on the front end cover 101 and located inside the housing 110, i.e., immersed in the oil inside the housing 110; the solenoid switch valve 113, conversion joint 114, check valve 115, and plug 116 are all integrated on the pump outlet valve block 112, making the overall structure compact.

[0048] In this embodiment, the watertight motor 120 drives the double gear pump 111 to supply oil to the system. The system high / low flow switching is achieved through the control of the electromagnetic switch valve 113 and the one-way valve 115, saving system energy consumption. The control circuit composed of the electromagnetic reversing valve 117, the two-way hydraulic lock 118 and the first one-way throttle valve 103 is used to control the lifting multi-stage cylinder 4, realizing the extension, locking and speed control of the lifting multi-stage cylinder 4. The cartridge-type overflow valve 106 is used to regulate the system pressure, the first quick-connect connector 102 is used to connect to the external pipeline, and the pressure test connector 107 is used for pressure testing and venting.

[0049] See Figure 4 As shown, the compensator assembly 2 includes a compensator housing 21, a compensating spring 22, a guide cylinder 23, a piston 24, a rolling diaphragm 25, a front cover 26, and a second adapter 27.

[0050] The compensator housing 21 has a front cover 26 at its open end, and a rolling diaphragm 25 is disposed between the front cover 26 and the diaphragm 25. Sealing is achieved by pressing the sealing edge of the rolling diaphragm 25. Inside the compensator housing 21, a cooperating guide cylinder 23 and a piston 24 are disposed. The piston 24 is connected to the rolling diaphragm 25. A compensating spring 22 acting on the piston 24 is disposed on the surface of the guide cylinder 23, meaning the compensating spring 22 is located between the piston 24 and the housing 21. A second adapter 27 connecting to the hydraulic power station 1 is disposed on the outer wall of the front cover 26.

[0051] In this embodiment, the rolling diaphragm 25 can move left and right with the piston 24; the guide cylinder 23 guides the compensating spring 22. The second adapter 27 can be connected to the hydraulic power station 1 via a pipeline to achieve compensation.

[0052] Furthermore, a pressure testing connector 28 and a second quick-connect connector 29 are also installed on the front cover 26. The pressure testing connector 28 is used for pressure testing and venting, and the second quick-connect connector 29 is used for oil filling.

[0053] See Figure 5As shown, the control valve box 3 includes a third quick-connect connector 301, a watertight connector 302, a housing 305, a valve block 306, a second one-way throttle valve 307, a two-way hydraulic lock 308, a solenoid directional valve 309, and a valve box compensator 310.

[0054] The inner side of the housing 305 is provided with a two-way hydraulic lock 308 and a solenoid directional valve 309, both of which are immersed in oil. One end of the housing 305 is provided with an oil filling port 303 and a watertight connector 302, and the other end is provided with a valve box compensator 310. The outer side of the housing 305 is also provided with a valve block 306, on which a third quick-connect connector 301 and a second one-way throttle valve 307 are respectively provided.

[0055] Specifically, a valve box cover plate 304 is provided at the open end of the outer casing 305, the second one-way throttle valve 307 is in contact with seawater, and the quick-connect connector 301 is connected to the tilting hydraulic cylinder 5 through a pipeline. The watertight connector 302 and the valve box compensator 310 are used for electrical connection, rapid oil filling, and independent seawater pressure compensation of the control valve box 3. The electromagnetic reversing valve 309, the two-way hydraulic lock 308, and the second one-way throttle valve 307 are used to control the tilting hydraulic cylinder 5, realizing the extension, locking, and speed control of the tilting hydraulic cylinder 5.

[0056] In this embodiment, both the first one-way throttle valve 103 and the second one-way throttle valve 307 are cartridge-type one-way throttle valves, which are simple in structure, easy to install, and reliable in function.

[0057] See Figure 6 As shown, the lifting multi-stage cylinder 4 includes a cable sensor 402, a cylinder barrel 405, an oil pipe, a piston rod 410, a piston 411, and a piston rod assembly.

[0058] The cylinder 405 contains a piston rod 410 and a piston 411, and a multi-stage piston rod assembly is arranged sequentially. A wire sensor 402 is built into the bottom of the cylinder 405 and connected to the piston 411 for measuring the stroke. An oil pipe is provided on the surface of the cylinder 405 to connect the inner cavity to the outside.

[0059] Furthermore, the pull-wire sensor 402 is installed inside the cylinder 405 via a watertight adapter 403 and a watertight connector 404 to ensure reliable connection and watertightness.

[0060] Furthermore, the oil pipe includes a first oil pipe 404 and a second oil pipe 408 connecting the two ends of the cylinder 405. The two are connected to the outside through a third adapter 409. A first hinge joint 407 is also provided on the outer wall of the cylinder 405 to facilitate the installation and connection of the oil pipe.

[0061] Specifically, the cylinder 405 has a sealed connection to the rear cover plate 401 at its open end. The internal piston rod 410 and piston 411 are respectively a four-stage piston rod and a four-stage piston, with the head interface of the piston rod 410 being threaded. The oil pipes, namely the first oil pipe 404 and the second oil pipe 408, are arranged axially along the cylinder 405 and are made of seamless stainless steel. The multi-stage piston rod assembly includes a third-stage piston rod assembly 412, a second-stage piston rod assembly 413, and a first-stage piston rod assembly 414 arranged radially along the piston rod 410, respectively functioning as the first, second, and third stage pistons.

[0062] See Figure 7 As shown, the tilting hydraulic cylinder 5 includes a base 502, a piston 503, a piston rod 504, a cylinder 505, a watertight connector 506, a second hinge joint 507, a proximity switch 508, an adapter 509, a front end cover 510, and a rod end lug 511.

[0063] The cylinder 505 has proximity switches 508 on its front and rear surfaces, and an adapter 509 is provided to seal the proximity switches 508. A watertight connector 506 is mounted on the adapter 509. The surface of the cylinder 505 also has a second hinged joint 507 corresponding to the position of the proximity switches 508. The cylinder 505 has a mating piston 503 and piston rod 504 inside its cavity, with a base 502 and a front end cap 510 at each end. The end of the piston rod 504 extends out of the front end cap 510 and is provided with a rod end lug 511.

[0064] Furthermore, the base 502 and the rod end ear 511 are respectively provided with spherical bearings 501. By providing spherical bearings 501, it is convenient for the tilting hydraulic cylinder 5 to rotate. The fit clearance is small, which is beneficial to control the amount of mast sway.

[0065] Specifically, the proximity switch 508 determines the starting and ending positions of the tilting hydraulic cylinder 5 by detecting the position of the piston 503. The installation positions of the proximity switch 508 and the hinge joint 507 differ by a certain angle along the circumference of the cylinder 505, facilitating the external connection of the watertight connector 506 and the hinge joint 507.

[0066] The hydraulic drive system for raising and lowering the mast of an underwater vehicle provided by this invention is small in size and highly modular, which is beneficial to the overall layout of the underwater vehicle.

[0067] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An underwater vehicle mast raising and lowering hydraulic drive system, characterized by: It includes a hydraulic power station, a compensator assembly, a control valve box, a multi-stage lifting cylinder, and a tilting hydraulic cylinder; the hydraulic power station provides a power source for switching between high and low flow rates in the system and controls the multi-stage lifting cylinder; The hydraulic power unit includes a front cover, a rear cover, a housing, a double gear pump, a pump outlet valve block, an electromagnetic switch valve, a conversion joint, a plug, and a watertight motor. The housing has openings at both ends, with the front cover and rear cover respectively. The double gear pump is housed within the housing. The watertight motor is mounted on the front cover and connected to the double gear pump. The pump outlet valve block is located on the inner side of the double gear pump. An oil passage is formed on the pump outlet valve block, with an electromagnetic switch valve and a plug at each end of the oil passage. A conversion joint penetrating the opposite sidewalls is located on the pump outlet valve block and the double gear pump. The conversion joint communicates with the oil passage and is connected to the inner wall of the housing. The compensator assembly is connected to the hydraulic power station and is used for pressure compensation and volume compensation; the control valve box is connected to the hydraulic power station and controls the tilting hydraulic cylinder; the lifting multi-stage cylinder and the tilting hydraulic cylinder respectively control the mast lifting and tilting actions; The multi-stage lifting cylinder includes a pull-wire sensor, a cylinder barrel, oil pipes, a piston rod, a piston, and a piston rod assembly. The piston rod and piston are disposed inside the cylinder barrel, and multi-stage piston rod assemblies are sequentially arranged. The pull-wire sensor is built into the bottom of the cylinder barrel and connected to the piston. An oil pipe communicating between the inner cavity and the outside is disposed on the surface of the cylinder barrel. The pull-wire sensor is disposed inside the cylinder barrel via a watertight adapter and a watertight connector. The oil pipe includes a first oil pipe and a second oil pipe connecting the two ends of the cylinder barrel, both of which are connected to the outside via a third adapter. The tilting hydraulic cylinder includes a base, a piston, a piston rod, a cylinder barrel, a watertight connector, a hinge joint, a proximity switch, an adapter seat, a front cover for the tilting hydraulic cylinder, a spherical bearing, and a rod end lug. The cylinder barrel has a proximity switch on its surface and an adapter seat for sealing; the adapter seat also has a watertight connector. The cylinder barrel also has a hinge joint on its surface, and a mating piston and piston rod are installed inside the cylinder. The base and the front cover for the tilting hydraulic cylinder are located at opposite ends. The piston rod extends beyond the front cover and has a rod end lug. Spherical bearings are also installed on the base and the rod end lug.

2. The underwater vehicle mast hoist hydraulic drive system of claim 1, wherein: One-way valves are respectively provided on the oil passage between the adapter and the electromagnetic switch valve and the plug; a first adapter, a high-pressure filter, a cartridge-type overflow valve and a watertight connector are respectively provided on the front cover of the hydraulic power station and on the outside of the housing.

3. The underwater vehicle mast hoist hydraulic drive system of claim 2, wherein: The hydraulic power station front cover is provided with a first one-way throttle valve and a two-way hydraulic lock on the outer and inner sides of the housing, respectively. The inner side of the housing is also provided with an electromagnetic reversing valve.

4. The underwater vehicle mast hoist hydraulic drive system of claim 1, wherein: The compensator assembly includes a compensator housing, a compensating spring, a guide cylinder, a piston, a rolling diaphragm, a front cover, and a second adapter. The front cover is provided at the open end of the compensator housing, and a rolling diaphragm is provided between the front cover and the front cover. A guide cylinder and a piston are provided inside the compensator housing, and the piston is connected to the rolling diaphragm. A compensating spring acting on the piston is provided on the surface of the guide cylinder. A second adapter connecting to the hydraulic power station is provided on the front cover.

5. The underwater vehicle mast hoist hydraulic drive system of claim 4, wherein: Pressure test connectors and quick-connect connectors are installed on the front cover of the hydraulic power station and the front cover of the compensator assembly. The pressure test connectors are used for pressure testing and venting, and the quick-connect connectors are used for oil injection.

6. The underwater vehicle mast hoist hydraulic drive system of claim 1 or 4, characterized by: The control valve box includes a third quick-connect connector, a watertight connector, a housing, a valve block, a second one-way throttle valve, a two-way hydraulic lock, a solenoid directional valve, and a valve box compensator. The two-way hydraulic lock and the solenoid directional valve are installed inside the housing. One end of the housing is provided with an oil filling interface and a watertight connector is installed thereon, and the other end is provided with a valve box compensator. A valve block is also provided on the outside of the housing, and the third quick-connect connector and the second one-way throttle valve are respectively installed on the valve block.

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