Compact actuating mechanism of direct-drive electro-hydraulic servo hydraulic unit

Abstract

The utility model relates to a compact actuating mechanism of a direct-drive electro-hydraulic servo hydraulic unit, which belongs to the field of actuating mechanisms and comprises a fin shaft, a fin, a hydraulic unit, a frame and a single-arm fin handle. The fin shaft is mounted on one side in the fin, and one end of the fin shaft extends out of the fin, penetrates through the rack and is fixedly connected with the single-arm fin handle; the hydraulic unit is a direct-drive electro-hydraulic servo hydraulic system, is mounted on one side of the rack, and comprises a single-rod hydraulic cylinder; the bottom end of a piston rod of the single-rod hydraulic cylinder is connected with the outer end of the single-arm fin handle; when the piston rod ascends and descends, the single-piston-rod hydraulic cylinder drives the fin shaft and the fin to rotate through the single-arm fin handle. The hydraulic unit is effectively integrated on the executing mechanism, and has the advantages of being small in size, light in weight, low in noise, small in energy loss and free of piping.

Description

Technical Field

[0001] The utility model relates to the field of actuators, and particularly to a compact actuator for a direct-drive electro-hydraulic servo hydraulic unit. Background Art

[0002] The existing fin stabilizer generally adopts a double-fin handle actuator equipped with two single-output shaft hydraulic cylinders and a separately arranged split hydraulic unit. Most of the fin rotation drive hydraulic systems adopt electro-hydraulic servo systems, which have the advantages of large fin rotation torque, high safety of the hydraulic system, and the ability to achieve stepless speed regulation. The disadvantages are as follows: Since a constant-speed three-phase asynchronous motor is used to drive an axial variable pump, the flow control of the hydraulic system is implemented by a servo valve through the principle of throttle speed regulation, resulting in a large volume of the hydraulic unit, high noise, generally reaching above 80 dB, large energy loss, and the energy utilization rate being below 70%. Content of the Utility Model

[0003] To overcome the deficiencies of the traditional actuator and hydraulic unit of the existing fin stabilizer, such as large volume, high noise, and large energy loss, the utility model provides a compact actuator for a direct-drive electro-hydraulic servo hydraulic unit, which is used for a fin stabilizer and has the characteristics of small volume, light weight, low noise, and small energy loss.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] A compact actuator for a direct-drive electro-hydraulic servo hydraulic unit, the actuator includes a fin shaft, a fin, a hydraulic unit, a frame, and a single-arm fin handle;

[0006] The fin shaft is installed on one side inside the fin, and one end of the fin shaft extends out of the fin, passes through the frame, and is fixedly connected to the single-arm fin handle;

[0007] The hydraulic unit is a direct-drive electro-hydraulic servo hydraulic system, which is installed on one side of the frame. The hydraulic unit includes a single-rod hydraulic cylinder; the bottom end of the piston rod of the single-rod hydraulic cylinder is connected to the outer end of the single-arm fin handle; when the piston rod moves up and down, the single-rod hydraulic cylinder drives the fin shaft and the fin to rotate through the single-arm fin handle.

[0008] Further, the hydraulic unit further includes a pressurized oil tank, a bi-directional radial piston pump, and a servo motor; the servo motor is connected to the bi-directional radial piston pump and is used to drive the bi-directional radial piston pump to rotate; the suction port of the bi-directional radial piston pump is connected to the oil port of the pressurized oil tank through a first pipeline, and the two oil outlets of the bi-directional radial piston pump are respectively connected to the upper oil chamber and the lower oil chamber of the single-rod hydraulic cylinder through a second pipeline; the piston rod of the single-rod hydraulic cylinder moves up and down under the drive of the bi-directional radial piston pump and the servo motor.

[0009] Furthermore, the hydraulic unit further includes an oil filling valve group and a two-way movement valve group; the oil filling valve group is composed of a first electromagnetic reversing valve and a second electromagnetic reversing valve, and the two-way movement valve group is composed of a third electromagnetic reversing valve and a fourth electromagnetic reversing valve;

[0010] The oil ports of the pressure charging oil tank are respectively connected to the two oil suction ports of the double radial piston pump through two of the first pipes; the first electromagnetic reversing valve and the second electromagnetic reversing valve are respectively installed on the first pipe to control the on-off of the first pipe; the third electromagnetic reversing valve and the fourth electromagnetic reversing valve are respectively installed on the second pipe to control the on-off of the second pipe.

[0011] Furthermore, the hydraulic unit further includes a valve block; the first pipe and the second pipe are respectively arranged inside the valve block; the servo motor is installed below the valve block; the double radial piston pump is installed inside the valve block; the pressure charging oil tank and the single rod hydraulic cylinder are respectively arranged at the left and right ends of the valve block; the hydraulic unit is installed on one side of the frame through the valve block.

[0012] Furthermore, the hydraulic unit further includes a reinforcing rib plate; the part of the valve block where the double radial piston pump is installed is connected to the part of the valve block where the single rod hydraulic cylinder is installed through the reinforcing rib plate.

[0013] Furthermore, the actuator further includes a trunnion; the valve block is installed on one side of the frame through the trunnion.

[0014] Furthermore, the actuator further includes a fin angle feedback device; the fin angle feedback device is installed at the end of the fin shaft for real-time detection of the rotation fin angle of the fin.

[0015] Furthermore, the single-arm fin handle includes a U-shaped buckle structure and a fin handle, the fin handle is installed on one side of the U-shaped buckle structure, and the U-shaped buckle structure is clamped on the fin shaft; the outer end of the fin handle is connected to the piston rod of the single rod hydraulic cylinder.

[0016] Furthermore, the outer end of the fin handle is connected to the bottom end of the piston rod of the single rod hydraulic cylinder through a pin shaft.

[0017] Furthermore, the actuator further includes a front bearing and a rear bearing; the front bearing and the rear bearing are respectively installed on the frame; the fin shaft extends out of the fin and passes through the front bearing and the frame in sequence and is installed in the rear bearing.

[0018] The beneficial effects of the present utility model:

[0019] The utility model has a compact structure, featuring small size, light weight, low noise, and small energy loss. The compact actuator of the utility model has a volume of about 80% of the total volume of the traditional actuator and the hydraulic system, and a weight of about 80%.

[0020] The hydraulic unit of the utility model adopts a direct-drive electro-hydraulic servo hydraulic system, which is effectively integrated on the actuator to achieve a compact structure of the actuator. The direct-drive electro-hydraulic servo hydraulic system uses a low-noise servo motor and a bi-directional radial piston pump, which can reduce the noise by 5 - 10 dB. The hydraulic unit adopts a closed system, which can make the energy utilization rate above 80%.

[0021] All components of the hydraulic unit in the utility model are integrated on the valve block, achieving a valve-block type compact structure of the hydraulic unit, realizing the pipe-free connection of the hydraulic unit, and featuring miniaturization and light weight.

[0022] The utility model adopts a design scheme of only equipped with a single compact hydraulic unit on each actuator, avoiding the problem of force application synchronization caused by using double hydraulic units, and simplifying the structure and control scheme of the actuator. Description of the Drawings

[0023] Figure 1 It is a three-dimensional schematic diagram of the compact actuator of the direct-drive electro-hydraulic servo hydraulic unit of the utility model;

[0024] Figure 2 It is for the compact actuator of the direct-drive electro-hydraulic servo hydraulic unit of the utility model relative to Figure 1 The attitude schematic diagram of the fin rotating 180°;

[0025] Figure 3 It is a schematic diagram of the hydraulic unit in the utility model.

[0026] Wherein: 1 - fin shaft, 2 - fin, 3 - front bearing, 4 - hydraulic unit, 4.1 - oil filling valve group, 4.2 - bi-directional movement valve group, 4.3 - single-rod hydraulic cylinder, 4.4 - pressurized oil tank, 4.5 - bi-directional radial piston pump, 4.6 - servo motor, 4.7 - reinforcing rib plate, 4.8 - connection hole, 4.9 - valve block, 5 - frame, 6 - single-arm fin handle, 7 - rear bearing, 8 - fin angle feedback device, 9 - trunnion, 10 - pin shaft. Detailed Description of the Invention

[0027] The following combines the description of the drawings and embodiments to further describe the detailed implementation of the utility model in detail. The following embodiments are only used to illustrate the utility model, but not to limit the scope of the utility model.

[0028] The terms indicating orientation or positional relationship such as up, down, left, right, inside, outside, front end, rear end, head, tail, etc. in this application document are established based on the orientation or positional relationship shown in the drawings. If the drawings are different, the corresponding positional relationship may also change accordingly. Therefore, it should not be understood as a limitation of the protection scope.

[0029] In the present utility model, the terms "installation", "connection", "engagement", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or a connection capable of mutual communication, a direct connection, or an indirect connection through an intermediate medium. It can be the connection inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] This embodiment describes a compact actuator of a direct-drive electro-hydraulic servo hydraulic unit. The hydraulic unit in the actuator adopts a direct-drive electro-hydraulic servo hydraulic system, which is effectively integrated on the actuator. The actuator has a compact structure and features small volume, light weight, low noise, and small energy loss.

[0031] As Figure 1 and Figure 2 shown, the actuator includes a fin shaft 1, fins 2, a front bearing 3, a hydraulic unit 4, a frame 5, a single-arm fin handle 6, a rear bearing 7, a fin angle feedback device 8, a trunnion 9, and a pin shaft 10.

[0032] The fin shaft 1 is installed on one side inside the fin 2. One end of the fin shaft 1 extends out of the fin 2 and passes through the front bearing 3 and the frame 5 in sequence and is installed in the rear bearing 7. The front bearing 3 and the rear bearing 7 are respectively installed on the frame 5 to support the fin shaft 1. A fin angle feedback device 8 is installed at the end of the fin shaft 1 to detect the rotation fin angle of the fin 2 in real time and transmit the fin angle information to the control system to control the action of the actuator.

[0033] Between the frame 5 and the rear bearing 7, the single-arm fin handle 6 is fixed on the fin shaft 1. Preferably, the single-arm fin handle 6 includes a U-shaped buckle structure and a fin handle. The fin handle is installed on one side wall of the U-shaped buckle structure. The single-arm fin handle 6 is clamped on the fin shaft 1 through the U-shaped buckle structure, and the fin handle is placed outside the frame 5. A pin hole is provided at the outer end of the fin handle. One end of the pin shaft 10 is installed in the pin hole, and the other end extends into the connection hole 4.8 of the hydraulic unit 4 to realize the connection between the hydraulic unit 4 and the single-arm fin handle 6. The single-arm fin handle 6 transmits the force generated by the hydraulic unit 4 to the fin shaft 1 through the pin shaft 10, and drives the fin 2 to rotate through the fin shaft 1. In this embodiment, the use of the single-arm fin handle 6 reduces the volume of the actuator.

[0034] As Figure 3As shown in the figure, the hydraulic unit 4 includes an oil filling valve group 4.1, a two-way movement valve group 4.2, a single-rod hydraulic cylinder 4.3, a pressurized oil tank 4.4, a two-way radial piston pump 4.5, a servo motor 4.6, a reinforcing rib plate 4.7, a connection hole 4.8, and a valve block 4.9.

[0035] The servo motor 4.6 is installed below the valve block 4.9 and is connected to the two-way radial piston pump 4.5 placed inside the valve block 4.9, and is used to drive the two-way radial piston pump 4.5 to act, and input oil fluid with a certain flow rate and pressure into the single-rod hydraulic cylinder 4.3 according to the control requirements output by the control system. The pressurized oil tank 4.4 and the single-rod hydraulic cylinder 4.3 are respectively installed at the left and right ends of the valve block 4.9. The single-rod hydraulic cylinder 4.3 of this embodiment controls the rotation speed and angle of the fin 2 through a mechanical transmission mechanism, which can effectively reduce the volume of the hydraulic unit 4 and meet the requirements of miniaturization of the actuator. The valve block 4.9 is installed on one side of the frame 5 through a trunnion 9, and effectively integrates the hydraulic unit 4 on the frame 5 to realize a compact structure of the actuator.

[0036] In this embodiment, the oil filling valve group 4.1 is composed of a first electromagnetic directional valve and a second electromagnetic directional valve, and the two-way movement valve group 4.2 is composed of a third electromagnetic directional valve and a fourth electromagnetic directional valve. There are two first pipelines and two second pipelines provided inside the valve block 4.9.

[0037] The oil ports of the pressurized oil tank 4.4 are respectively connected to the two oil suction ports of the two-way radial piston pump 4.5 through the first pipelines, and the first electromagnetic directional valve and the second electromagnetic directional valve are respectively installed on the two first pipelines, and the on-off of the two first pipelines can be respectively controlled through the first electromagnetic directional valve and the second electromagnetic directional valve. The two oil outlet ports of the two-way radial piston pump 4.5 are respectively connected to the upper oil chamber and the lower oil chamber of the single-rod hydraulic cylinder 4.3 through the second pipelines, and the third electromagnetic directional valve and the fourth electromagnetic directional valve are respectively installed on the two second pipelines, and the on-off of the two second pipelines can be respectively controlled through the third electromagnetic directional valve and the fourth electromagnetic directional valve.

[0038] When the first electromagnetic directional valve or the second electromagnetic directional valve connects the first pipeline, the two-way radial piston pump 4.5 sucks the oil fluid in the pressurized oil tank 4.4 under the drive of the servo motor 4.6, the third electromagnetic directional valve or the fourth electromagnetic directional valve opens, and the oil fluid is sent into the upper oil chamber or the lower oil chamber of the single-rod hydraulic cylinder 4.3 through the second pipeline, realizing the lowering or rising of the piston rod.

[0039] When the piston rod of the single-rod hydraulic cylinder 4.3 retracts, the third electromagnetic directional valve or the fourth electromagnetic directional valve opens in the reverse direction, the first electromagnetic directional valve or the second electromagnetic directional valve opens in the reverse direction, and part of the flow rate in the lower oil chamber or the upper oil chamber is returned to the pressurized oil tank 4.4.

[0040] In this embodiment, the two-way radial piston pump 4.5 is a two-displacement two-way radial piston pump. The two-displacement two-way axial piston pump has four-quadrant operating characteristics. Both the A and B working oil ports are high-pressure oil ports. The pressure rating of the pump reaches 35 MPa, the noise is lower than 70 dB, and there are two displacements available during actual operation. The complexity of the two-way axial piston pump 4.5 is low.

[0041] The connecting hole 4.8 is provided at the bottom end of the piston rod of the single-rod cylinder 4.3 and is used to connect to the single-arm fin handle 6 through the pin shaft 10. The valve block 4.9 for installing the two-way radial piston pump 4.5 is partially connected to the valve block 4.9 for installing the single-rod cylinder 4.3 through the reinforcing rib plate 4.7, which can effectively improve the overall stiffness of the hydraulic unit 4 while ensuring the stable movement of the piston rod of the single-rod cylinder 4.3.

[0042] In this embodiment, the oil filling valve group 4.1, the two-way movement valve group 4.2, the two-way radial piston pump 4.5, the servo motor 4.6, the fin angle feedback device 8, etc. are respectively connected to the control system. At the same time, the control system performs control calculation based on the ship roll motion signal, changes the speed and rotation direction of the servo motor 4.6 through the controller of the servo motor 4.6, drives the two-way radial piston pump 4.5 to output different magnitudes and directions of flow to the single-rod cylinder 4.3, and feeds back the actual fin angle to the control system through the fin angle feedback device 8 to achieve the control of the rotation speed and rotation direction of the fin 2 by the actuator, causing the fin 2 to generate a righting moment on the ship to reduce the ship's roll.

[0043] The control system has an automatic selection function for the pump displacement and can automatically select the displacement of the two-way radial piston pump 4.5 according to the ship speed condition. When the displacement of the two-way radial piston pump 4.5 is large, it is suitable for the low ship speed and large fin angle rotation condition. When the displacement is small, it is suitable for the high ship speed and small fin rotation condition. The two displacements greatly increase the fin angle range of the anti-rolling fin and are suitable for the anti-rolling fin at all ship speeds.

[0044] Although the principle of the present invention has been described in detail above in combination with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are only explanations of the schematic implementation modes of the present invention and do not limit the scope of the present invention. The details in the embodiments do not constitute a limitation on the scope of the present invention. Without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformation and simple replacement based on the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A compact actuator of a direct-drive electro-hydraulic servo hydraulic unit, characterized in that: The actuator comprises a fin shaft (1), a fin (2), a front bearing (3), a hydraulic unit (4), a frame (5), a single-arm fin handle (6) and a rear bearing (7); The front bearing (3) and the rear bearing (7) are respectively mounted on the frame (5); the fin shaft (1) is mounted on one side of the inside of the fin (2); one end of the fin shaft (1) extends out of the fin (2) and passes through the front bearing (3) in sequence; the frame (5) is mounted in the rear bearing (7); the fin shaft (1) is fixedly connected to the single-arm fin handle (6); The hydraulic unit (4) is a direct-drive electro-hydraulic servo hydraulic system, which is installed on one side of the frame (5). The hydraulic unit (4) comprises a single-rod hydraulic cylinder (4.3), a pressurized oil tank (4.4), a bidirectional radial piston pump (4.5), a servo motor (4.6), and a valve block (4.9); the valve block (4.9) is composed of a valve block (4.9) part for installing the bidirectional radial piston pump (4.5) and a valve block (4.9) part for installing the single-rod hydraulic cylinder (4.3); the valve block (4.9) is installed on the frame (5), and the valve block (4.9) part for installing the single-rod hydraulic cylinder (4.3) is connected to the frame (5) via an ear shaft (9); the bottom end of the piston rod of the single-rod hydraulic cylinder (4.3) is connected to the frame (5) via a pin shaft (10). ) is connected to the outer end of the single-arm fin handle (6); the servo motor (4.6) is connected to the bidirectional radial piston pump (4.5) and is used to drive the bidirectional radial piston pump (4.5) to rotate; the oil suction port of the bidirectional radial piston pump (4.5) is connected to the oil port of the pressurized oil tank (4.4) through a first pipeline, and the two oil outlets of the bidirectional radial piston pump (4.5) are respectively connected to the upper oil chamber and the lower oil chamber of the single-rod hydraulic cylinder (4.3) through a second pipeline; the piston rod of the single-rod hydraulic cylinder (4.3) rises and falls under the drive of the bidirectional radial piston pump (4.5) and the servo motor (4.6); when the piston rod rises and falls, the single-rod hydraulic cylinder (4.3) drives the fin shaft (1) and the fin (2) to rotate through the single-arm fin handle (6).

2. The compact actuator of the direct-drive electro-hydraulic servo hydraulic unit according to claim 1, characterized in that: The hydraulic unit (4) further comprises an oil filling valve group (4.1) and a two-way motion valve group (4.2); the oil filling valve group (4.1) comprises a first electromagnetic reversing valve and a second electromagnetic reversing valve, and the two-way motion valve group (4.2) comprises a third electromagnetic reversing valve and a fourth electromagnetic reversing valve; The oil port of the pressurized oil tank (4.4) is respectively connected to the two oil suction ports of the bidirectional radial piston pump (4.5) through the two first pipes; the first electromagnetic reversing valve and the second electromagnetic reversing valve are respectively installed on the first pipe, and are used to control the on-off of the first pipe; the third electromagnetic reversing valve and the fourth electromagnetic reversing valve are respectively installed on the second pipe, and are used to control the on-off of the second pipe.

3. The compact actuator of the direct-drive electro-hydraulic servo hydraulic unit according to claim 1, characterized in that: The first pipeline and the second pipeline are respectively arranged in the valve block (4.9) part where the bidirectional radial piston pump (4.5) is installed; the servo motor (4.6) is installed below the valve block (4.9); the pressurized oil tank (4.4) and the single-rod hydraulic cylinder (4.3) are respectively arranged at the left and right ends of the valve block (4.9); and the hydraulic unit (4) is installed on one side of the frame (5) through the valve block (4.9).

4. The compact actuator of the direct-drive electro-hydraulic servo hydraulic unit according to claim 3, characterized in that: The hydraulic unit (4) further comprises a reinforcing rib plate (4.7); the valve block (4.9) portion on which the bidirectional radial piston pump (4.5) is mounted is connected to the valve block (4.9) portion on which the single-rod hydraulic cylinder (4.3) is mounted via the reinforcing rib plate (4.7).

5. The compact actuator of the direct-drive electro-hydraulic servo hydraulic unit according to claim 1, characterized in that: The actuator also includes a fin angle feedback device (8); the fin angle feedback device (8) is installed at the end of the fin shaft (1) and is used to detect the rotation fin angle of the fin (2) in real time.

6. The compact actuator of the direct-drive electro-hydraulic servo hydraulic unit according to claim 1, characterized in that: The single-arm fin handle (6) comprises a U-shaped buckle structure and a fin handle, wherein the fin handle is mounted on one side of the U-shaped buckle structure, and the U-shaped buckle structure is buckled onto the fin shaft (1); the outer end of the fin handle is connected to the piston rod of the single-rod hydraulic cylinder (4.3).

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