Split type electro-hydraulic direct-drive non-retractable fin stabilizer hydraulic system

Abstract

The invention relates to a split type electro-hydraulic direct-driven non-retractable fin stabilizer hydraulic system which comprises a hydraulic unit and an actuating mechanism which are independently arranged, and the actuating mechanism comprises fin rotating oil cylinders which are symmetrically arranged; a bidirectional hydraulic pump driven by a servo motor forms a closed fin rotating loop; the bidirectional hydraulic pump driven by the servo motor, the hydraulic unit and the actuating mechanism form an electro-hydraulic direct-drive fin stabilizer device; the control loop is composed of a gyroscope, a controller and an executing mechanism, and the gyroscope detects the rolling angular velocity of the ship and generates a fin rotating instruction signal; the controller compares the instruction signal with the fin angle feedback signal and outputs a servo motor rotating speed instruction; the servo driver controls the servo motor to rotate forwards and backwards, the bidirectional hydraulic pump is driven to adjust the displacement of the fin rotating oil cylinder, and therefore the fin is driven to rotate. A valve control or pump control type hydraulic system adopted by a traditional fin stabilizer is replaced, integrated optimization, light weight, high efficiency, high reliability and low noise of the fin stabilizer hydraulic system are achieved, and the occupied space of equipment is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship roll reduction, and particularly relates to a split-type electro-hydraulic direct drive non-retractable fin hydraulic system, which is applicable to the roll suppression of medium and large-sized ships. Background Technique

[0002] When a ship is sailing or mooring at sea, it will generate roll motion due to the influence of wind and waves. As the main device for reducing ship roll, fin stabilizers have been widely applied in actual ships, and can effectively reduce the ship roll angle when sailing in strong winds and waves.

[0003] Fin stabilizer devices are divided into retractable fin stabilizers and non-retractable fin stabilizers according to whether the fins can be retracted into the hull.

[0004] The direct drive volume control electro-hydraulic servo system is a new type of electro-hydraulic servo system. The servo motor serves as both the energy element and the control element of the system, drives the bidirectional fixed displacement pump to operate to drive the load to move, and controls the flow rate and circulation direction of the hydraulic oil in the system by controlling the rotational speed and rotation direction of the motor, thereby controlling the movement of the load. Due to its advantages such as high integration, large power-to-weight ratio, high reliability, high efficiency, good installation and maintenance performance, etc., it can replace some traditional valve-controlled hydraulic systems in occasions where the requirements for system rapidity are not too high, improve the system efficiency and reliability, and reduce the equipment weight and size.

[0005] Applying the direct drive electro-hydraulic servo technology to the ship fin stabilizer device can realize the lightweight, high efficiency, low noise, reduction of equipment size, and improvement of device reliability of the fin stabilizer device, and develop an electro-hydraulic direct drive fin stabilizer device.

[0006] The electro-hydraulic direct drive non-retractable fin stabilizer has two types: integral type and split type. The integral type designs the pump, hydraulic cylinder, compensating oil tank and hydraulic valve into a complete device, which has a super-compact volume and is directly installed on the actuator, especially suitable for small power fin stabilizers on small ships such as small ferries and yachts.

[0007] The split type is suitable for medium and high power fin stabilizer devices. Since the power is large and the volume is relatively large, if the integral structure is used to install on the actuator, it will make the local volume huge, which is not conducive to the installation and maintenance of the actuator. Separating the hydraulic cylinder from the hydraulic unit makes the system more concise. The small-sized hydraulic unit is easier to arrange in any available space, and is suitable for the transformation of the fin stabilizer of an old ship and the need to add zero-speed function. Therefore, a split-type electro-hydraulic direct drive hydraulic unit is required for medium and large-sized fin stabilizer devices.

[0008] Traditional fin stabilizer hydraulic systems mostly adopt valve control or pump control schemes, and have the following defects:

[0009] 1. The throttling loss of the valve control system is large and the efficiency is low;

[0010] 2. The integral design leads to difficulties in the cabin layout;

[0011] 3. Lack of a power-off emergency operation module.

[0012] The present invention solves the above problems through a split direct drive design, a closed-loop circuit optimization, and an emergency manual mechanism. Summary of the Invention

[0013] The object of the present invention is to provide a split electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system, which replaces the valve-controlled or pump-controlled hydraulic system used in traditional fin stabilizers, and realizes the integrated optimization, lightweight, high efficiency, high reliability, low noise, and reduction of the equipment's occupied cabin space of the fin stabilizer hydraulic system.

[0014] To achieve the above object, the specific technical solution of the present invention is: a split electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system, comprising:

[0015] An independently arranged hydraulic unit and an actuator, wherein the actuator includes fin-rotating cylinders arranged symmetrically;

[0016] A bidirectional hydraulic pump driven by a servo motor, forming a closed fin-rotating circuit; the bidirectional hydraulic pump driven by the servo motor, the hydraulic unit, and the actuator form an electro-hydraulic direct drive fin stabilizer device;

[0017] A control circuit composed of a gyroscope, a controller, and an actuator, wherein the gyroscope detects the roll angular velocity of the ship and generates a fin-rotating command signal; the controller compares the command signal with the fin angle feedback signal and outputs a servo motor speed command; the servo driver controls the forward and reverse rotation of the servo motor to drive the bidirectional hydraulic pump to adjust the displacement of the fin-rotating cylinder, thereby driving the fin to rotate;

[0018] A makeup oil circuit, in which a dual hydraulic pump driven by an auxiliary motor supplies oil to the closed circuit through a check valve;

[0019] An unlocking circuit, which controls the spring compression of the locking mechanism through an electromagnetic directional valve to achieve mechanical unlocking;

[0020] An emergency hand pump and a manual directional valve, which are used to drive the fin-rotating cylinder to reset when the power is off.

[0021] Furthermore, the makeup oil circuit further includes: an accumulator, connected to the makeup oil pipeline, for stabilizing the makeup oil pressure; a pressure controller, which triggers an alarm when the makeup oil pressure is lower than 0.6 MPa; an overflow valve, which sets the makeup oil circuit pressure to 0.8 - 1.0 MPa.

[0022] Furthermore, the unlocking circuit includes: a dual hydraulic pump - an unlocking pump fills the accumulator with liquid through an electromagnetic directional valve; a pressure switch, which cuts off the power supply of the electromagnetic directional valve when the accumulator pressure reaches 5 MPa; an overflow valve, which sets the maximum pressure of the unlocking circuit to 6 MPa.

[0023] Further, the fin rotation circuit further includes: check valves arranged back-to-back, enabling the pressure oil port of the relief valve to be always connected to the high-pressure side of the circuit; check valves arranged face-to-face, introducing make-up oil into the low-pressure side of the circuit.

[0024] Further, the servo motor and the bi-directional hydraulic pump are cooled by: the make-up oil is branched through a throttle valve to the pump housing and the motor housing for flushing and cooling.

[0025] Further, the hydraulic unit integrates: a liquid level gauge, a temperature relay, an air filter, a liquid level control relay; when the oil temperature exceeds the set value or the liquid level is too low, shutdown protection is triggered.

[0026] Further, the emergency hand pump realizes through switching the manual directional control valve: driving the fin rotation cylinder to reset to the zero position; the locking mechanism automatically locks; wherein, oil pressure is generated by shaking the emergency hand pump; the manual directional control valve is switched to different functional positions to drive the fin rotation cylinder to reset.

[0027] Further, when a wave moment acts on the ship, the ship will roll, and the gyroscope in the anti-rolling fin will measure the ship's roll angular velocity, which is converted into a fin rotation command signal after signal processing and amplification; the electro-hydraulic direct drive anti-rolling fin device drives the fin to rotate according to the fin rotation command signal through a servo driver, a servo motor, a bi-directional hydraulic pump, and an actuator. Under the action of water flow, a lift force will be generated on the fin, forming a stabilizing moment on the ship, canceling out the wave moment, and reducing the roll of the ship.

[0028] Further, the controller outputs a command signal to the servo driver according to the difference between the fin rotation command signal and the fin angle feedback signal. After processing, the rotation speed and direction of the servo motor are controlled through the servo driver, and further the rotation speed and direction of the bi-directional hydraulic pump are controlled, realizing the control of the output flow and direction of the bi-directional hydraulic pump; the bi-directional hydraulic pump directly drives and controls the operation of the actuator, and feeds back the actual fin angle signal of the actuator into the controller, constituting a position closed-loop control system.

[0029] The beneficial effects of the present invention are as follows: 1) The split-type electro-hydraulic direct drive non-retractable anti-rolling fin hydraulic system of the present invention simplifies the valve-controlled or pump-controlled hydraulic system adopted by the traditional non-retractable anti-rolling fin, cancels control components such as servo valves or proportional valves, reduces the throttling loss of the hydraulic system, and improves the system efficiency; simplifies the system, improves the integration and reliability; reduces the weight and occupied cabin size of the hydraulic unit. 2) Using the split-type electro-hydraulic direct drive non-retractable anti-rolling fin hydraulic unit makes the system more concise, compact, and the miniaturized hydraulic unit is easier to arrange on the ship. Description of the Drawings

[0030] Figure 1 It is a control principle block diagram of the electro-hydraulic direct drive anti-rolling fin device of the present invention

[0031] Figure 2 This is the schematic diagram of the split electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system of the present invention;

[0032] In the figure: servo motor 1, two-way hydraulic pump 2 for variable speed drive, cooler 3, return oil filter 4, auxiliary motor 5, double-pump hydraulic pump - make-up oil pump 6, double-pump hydraulic pump - unlocking pump 7, filter 8, filter 9, check valve 10, relief valve 11, solenoid directional valve 12, check valve 13, liquid level gauge 14, temperature relay 15, air filter 16, liquid level control relay 17, pressure switch 18, accumulator 19, pressure measuring joint 20, pressure gauge 21, hand pump 22, relief valve 23, throttle valve 24, throttle valve 25, pressure controller 26, pressure measuring joint 27, pressure measuring joint 28, pressure gauge 29, accumulator 30, check valve 31, check valve 32, check valve 33, check valve 34, solenoid operated relief valve 35, relief valve 36, solenoid directional valve 37, pressure measuring joint 38, pressure gauge 39, pressure measuring joint 40, pressure gauge 41, pilot-operated check valve 42, pilot-operated check valve 43, solenoid directional valve 44, manual directional valve 45, fin turning cylinder 46, fin turning cylinder 47, locking mechanism 48, fin angle feedback device 49. Specific embodiments

[0033] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings of the specification.

[0034] As Figure 1 shown in Fig. 2, a split electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system of the present invention adopts a method of separately arranging the hydraulic transmission system and the hydraulic cylinder. The hydraulic cylinder is installed on the actuator and connected to the hull, and the hydraulic transmission system is designed as an independent hydraulic unit. The overall unit includes a hydraulic unit, an actuator, fins, fin bases, and electrical control equipment.

[0035] The split electro-hydraulic direct drive non-retractable fin stabilizer hydraulic unit includes a servo motor, a two-way hydraulic pump for variable speed drive, an auxiliary motor, a double-pump hydraulic pump, a solenoid directional valve, a relief valve, a check valve, a pilot-operated check valve, a cooler, a filter, and hydraulic accessories, etc.

[0036] The anti-rolling working principle of the electro-hydraulic direct drive fin stabilizer device is as follows: when the wave moment acts on the ship, the ship will roll. The gyroscope in the fin stabilizer will measure the rolling angular velocity of the ship, which is converted into a fin turning command signal after signal processing and amplification. The electro-hydraulic direct drive fin stabilizer device drives the fins to rotate according to the fin turning command signal through links such as a servo driver, a servo motor, a two-way hydraulic pump, and an actuator. Under the action of the water flow, a lift force will be generated on the fins, forming a stable moment on the ship, which cancels out the wave moment and reduces the rolling of the ship.

[0037] The working principle of the electro-hydraulic direct drive fin stabilizer is as follows: The controller processes the difference between the fin rotation command signal and the fin angle feedback signal, and then outputs a command signal to the servo driver. The servo driver controls the rotation speed and direction of the servo motor, thereby controlling the rotation speed and direction of the bi-directional hydraulic pump, achieving the control of the output flow rate and direction of the bi-directional hydraulic pump. The bi-directional hydraulic pump directly drives and controls the operation of the actuator. The actual fin angle signal of the actuator in the device is fed back into the controller, forming a position closed-loop control system. The actuator drives the fin to rotate, generating a certain fin angle, and relying on hydrodynamic force to reduce the roll of the ship.

[0038] As Figure 1 As shown in the figure, the control principle of the electro-hydraulic direct drive fin stabilizer device of the present invention is as follows: When the wave moment acts on the ship, the ship will roll. The gyroscope in the fin stabilizer will measure the roll angular velocity of the ship, which is converted into a fin rotation command signal after signal processing and amplification. The controller processes the difference between the fin rotation command signal and the fin angle feedback signal, and then outputs a command signal to the servo driver. The servo driver controls the rotation speed and direction of the servo motor, thereby controlling the rotation speed and direction of the bi-directional hydraulic pump, achieving the control of the output flow rate and direction of the bi-directional hydraulic pump. The bi-directional hydraulic pump directly drives and controls the operation of the actuator. The actual fin angle signal of the actuator in the device is fed back into the controller, forming a position closed-loop control system. The actuator drives the fin to rotate, generating a certain fin angle. Under the action of the water flow, a lift force will be generated on the fin, forming a stable moment on the ship, canceling out the wave moment, and reducing the roll of the ship.

[0039] As Figure 2 As shown in the figure, the split electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system of the present invention includes a servo motor 1, a variable speed drive bi-directional hydraulic pump 2, a cooler 3, an oil return filter 4, an auxiliary motor 5, a double-pump - make-up oil pump 6, a double-pump - unlocking pump 7, a filter 8, a filter 9, a check valve 10, a relief valve 11, an electromagnetic directional valve 12, a check valve 13, a liquid level gauge 14, a temperature relay 15, an air filter 16, a liquid level control relay 17, a pressure switch 18, an accumulator 19, a pressure measuring joint 20, a pressure gauge 21, a hand pump 22, a relief valve 23, a throttle valve 24, a throttle valve 25, a pressure controller 26, a pressure measuring joint 27, a pressure measuring joint 28, a pressure gauge 29, an accumulator 30, a check valve 31, a check valve 32, a check valve 33, a check valve 34, an electromagnetic relief valve 35, a relief valve 36, an electromagnetic directional valve 37, a pressure measuring joint 38, a pressure gauge 39, a pressure measuring joint 40, a pressure gauge 41, a pilot-operated check valve 42, a pilot-operated check valve 43, an electromagnetic directional valve 44, and a manual directional valve 45.

[0040] When the device starts to work, the actuator locked in the zero position needs to be unlocked first. After the auxiliary motor 5 starts, it drives the double - acting hydraulic pump - unlocking pump 7 to output hydraulic power. The electromagnetic directional valve 12 is energized, and the unlocking oil circuit and the accumulator 19 are filled with oil to build pressure. When the pressure exceeds the set value of 5 MPa of the pressure switch 18, the pressure switch sends a signal, and the electromagnetic directional valve 12 is de - energized, and the unlocking circuit holds the pressure. The maximum pressure of the unlocking circuit is set by the relief valve 36. After the working pressure is established in the unlocking circuit, when the electromagnetic directional valve 44 is energized, the pressurized oil enters the locking mechanism 48, compresses the spring therein, and unlocks the actuator. The maximum pressure at the pump port of the double - acting hydraulic pump - unlocking pump 7 is set by the relief valve 11.

[0041] After the actuator is unlocked, the auxiliary motor 5 drives the double - acting hydraulic pumps 6 and 7 to operate. The double - acting hydraulic pump - oil - replenishing pump 6 replenishes oil to the closed - loop circuit through the filter 9 and the check valve 10; the double - acting hydraulic pump - unlocking pump 7 replenishes oil to the closed - loop circuit through the filter 8, the electromagnetic directional valve 12, and the check valve 13 when the electromagnetic directional valve 12 is not energized, and builds the oil - replenishing pressure, which is 0.8 - 1.0 MPa.

[0042] An accumulator 30 is arranged in the oil - replenishing circuit, which can store a certain amount of oil and output oil to stabilize the pressure when the oil - replenishing pressure drops during the operation of the system. A pressure controller 26 is arranged in the oil - replenishing circuit. When the oil - replenishing pressure is lower than 0.6 MPa during the operation of the system, a low - pressure alarm is issued to protect the normal operation of the closed - loop fin - rotating circuit.

[0043] When the electromagnetic directional valve 37 is energized, the pilot - operated check valves 42 and 43 are opened. The servo motor 1 drives the double - acting hydraulic pump 2 to operate, and the output oil enters the two symmetrically arranged hydraulic cylinders on the actuator, driving it to reciprocate, and is converted into fin - rotating motion through the actuator. By controlling the speed and rotation direction of the motor, the flow rate and circulation direction of the oil in the fin - rotating circuit are controlled, and thus the precise control of the fin - rotating speed and direction is achieved.

[0044] The hydraulic system makes the pressure port of the relief valve 3 always connected to the high - pressure side of the fin - rotating circuit through two back - to - back arranged check valves 33 and 34. The pressure of the high - pressure side of the fin - rotating circuit is set by the relief valve 35. The oil replenished into the system can smoothly enter the low - pressure side of the fin - rotating circuit through two face - to - face arranged check valves 31 and 32. The pressure of the oil - replenishing circuit is set by the relief valve 23.

[0045] In the system, by connecting the oil - replenishing oil to the pump housing of the double - acting pump and the servo motor providing the cooling oil, the temperature of the hydraulic pump and the servo motor is reduced. Throttle valves 24 and 25 are arranged between the oil - replenishing oil and the double - acting hydraulic pump and the servo motor to regulate the oil flow rate.

[0046] In the event of a system power failure, the actuator can be rotated through the hand pump circuit and locked. When the hand pump 22 is operated by turning the handle to switch the manual directional valve 45, the fin can be rotated upward or downward. When the fin rotates to the zero position, the locking mechanism will lock and lock the fin at the zero position.

[0047] A cooler 3 is provided in the oil return circuit to remove the heat of the hydraulic system through heat exchange and reduce the temperature of the hydraulic system. An oil return filter 4 is provided in the oil return circuit to filter the oil in the oil return and clean the system.

[0048] A liquid level gauge 14, a temperature relay 15, an air filter 16, and a liquid level control relay 17 are integrated on the fuel tank. The function of the liquid level gauge is to observe the oil level in the fuel tank. The function of the temperature relay is to detect the oil temperature in the fuel tank. When the set high temperature value is reached, an alarm is triggered and the equipment stops running to protect the equipment. The function of the air filter is to filter the impurities and dust in the air entering the fuel tank. The function of the liquid level control relay is to monitor the oil level in the fuel tank. When the oil level is too low, an alarm is triggered and the equipment stops running to protect the equipment.

[0049] Pressure measuring joints 38, 40 and pressure gauges 39, 41 are provided on both sides of the fin rotation circuit to monitor the pressure on the high-pressure side and the low-pressure side of the fin rotation circuit. A pressure measuring joint 27 and a pressure gauge 29 are provided in the oil replenishing circuit to monitor the oil replenishing pressure. A pressure measuring joint 20 and a pressure gauge 21 are provided in the unlocking circuit to monitor the unlocking circuit pressure.

[0050] The core invention points of the present invention:

[0051] (1) Split layout: Integrate the fin stabilizer direct drive volume control electro-hydraulic servo system into a hydraulic unit (including a servo motor, a bidirectional hydraulic pump, and an oil replenishing pump) separated from the actuator, meeting the requirements of medium and high power (compared with the integral design of CN106545581A).

[0052] (2) Invent a type of split electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system to replace the valve-controlled or pump-controlled hydraulic system used in traditional fin stabilizers, achieving the integrated optimization, light weight, high efficiency, high reliability, low noise, and reduced equipment occupancy space of the fin stabilizer hydraulic system.

[0053] (3) Integrated safety module: The accumulators 19, 30 maintain pressure, the pressure switch 18 is interlocked for control, and the hand pump 22 is used for emergency operation, increasing the system reliability by 45%.

[0054] The technical effects produced by the technical solution of the present invention:

[0055] (1) The power of the electro-hydraulic direct drive fin stabilizer hydraulic unit is 60% of that of the traditional hydraulic valve control system, saving at least 40% of the energy;

[0056] (2) The volume and weight of the electro-hydraulic direct drive fin stabilizer hydraulic unit are 50% of those of the traditional hydraulic system, making it suitable for the retrofit of old ships;

[0057] (3) The electro-hydraulic direct drive fin stabilizer hydraulic system has been greatly simplified, improving the reliability of the equipment.

[0058] Verification of the technical effects of the present invention:

[0059] During the actual measurement of a 5,000-ton ship, the rolling angle of the ship decreased from ±15° to ±3°, and the anti-rolling efficiency reached 80%;

[0060] The weight of the hydraulic unit is reduced by 300 kg compared with the traditional system, and the installation space is reduced by 1.2 m 3 .

Claims

1. A split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system, comprising: An independently arranged hydraulic unit and an actuator, wherein the actuator comprises symmetrically arranged fin-turning cylinders; The bidirectional hydraulic pump driven by the servo motor forms a closed fin rotation circuit; the bidirectional hydraulic pump driven by the servo motor, the hydraulic unit and the actuator constitute the electro-hydraulic direct-drive fin stabilizer device; The control loop is composed of a gyroscope, a controller and an actuator. The gyroscope detects the ship's rolling angular velocity and generates a fin rotation command signal; the controller compares the command signal with the fin angle feedback signal and outputs a servo motor speed command; the servo driver controls the servo motor to rotate forward and reverse, drives the bidirectional hydraulic pump to adjust the displacement of the fin rotation cylinder, and thus drives the fin to rotate; The oil replenishment circuit is driven by an auxiliary motor to drive a double hydraulic pump and replenish oil to the closed circuit through a one-way valve; Unlocking circuit, which controls the spring compression of the locking mechanism through the electromagnetic reversing valve to achieve mechanical unlocking; The emergency hand pump and manual reversing valve are used to drive the fin cylinder to reset when the power is off.

2. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 1, characterized in that: The oil replenishment circuit further includes: an accumulator connected to the oil replenishment pipeline for stabilizing the oil replenishment pressure; The pressure controller triggers an alarm when the oil replenishment pressure is lower than 0.6MPa; the overflow valve sets the oil replenishment circuit pressure to 0.8~1.0MPa.

3. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 1, characterized in that: The unlocking circuit includes: a double hydraulic pump-unlocking pump to charge the accumulator through an electromagnetic reversing valve; a pressure switch to cut off the power supply of the electromagnetic reversing valve when the accumulator pressure reaches 5MPa; and a relief valve to set the maximum pressure of the unlocking circuit to 6MPa.

4. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 1, characterized in that: The fin-turning circuit also includes: one-way valves arranged back to back, so that the pressure oil port of the overflow valve is always connected to the high-pressure side of the circuit; and one-way valves arranged face to face, which guide the supplementary oil into the low-pressure side of the circuit.

5. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 1, characterized in that: The cooling of the servo motor and the bidirectional hydraulic pump is as follows: the replenishing oil is diverted to the pump housing and the motor housing through the throttle valve to flush and cool them.

6. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 1, characterized in that: The hydraulic unit integrates: a liquid level meter, a temperature relay, an air filter, and a liquid level control relay; when the oil temperature exceeds a set value or the liquid level is too low, a shutdown protection is triggered.

7. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 1, characterized in that: The emergency hand pump is realized by switching the manual reversing valve: driving the fin turning cylinder to reset to zero position; the locking mechanism is automatically locked; wherein, oil pressure is generated by shaking the emergency hand pump; switching the manual reversing valve to different functional positions drives the fin turning cylinder to reset.

8. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 1, characterized in that: When the wave torque acts on the ship, the ship will roll, and the gyroscope in the anti-roll fin will measure the ship's roll angular velocity, which is converted into a fin rotation command signal after signal processing and amplification; the electro-hydraulic direct-drive anti-roll fin device drives the fins to rotate according to the fin rotation command signal through a servo driver, servo motor, bidirectional hydraulic pump, and actuator. Under the action of the water flow, lift will be generated on the fins, forming a stabilizing torque for the ship, which offsets the wave torque and reduces the ship's roll.

9. The split type electro-hydraulic direct drive non-retractable fin stabilizer hydraulic system according to claim 8, characterized in that: The controller processes the difference between the fin rotation command signal and the fin angle feedback signal, and outputs a command signal to the servo driver after processing. The servo driver controls the speed and direction of the servo motor, and then controls the speed and direction of the bidirectional hydraulic pump, thereby achieving control of the output flow and direction of the bidirectional hydraulic pump; the bidirectional hydraulic pump directly drives and controls the operation of the actuator, and feeds back the actual fin angle signal of the actuator into the controller, forming a position closed-loop control system.

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