Single-action multi-rotation electro-hydraulic execution device

Abstract

The utility model provides a single-action multi-rotation electro-hydraulic actuating device which comprises a hydraulic actuator, a gear box, a local electro-hydraulic control unit and an energy accumulator control unit, the hydraulic actuator is connected with the gear box and used for converting linear motion into multi-rotation motion of an output shaft of the gear box, and the local electro-hydraulic control unit is connected with the energy accumulator control unit. The local electro-hydraulic control unit and the energy accumulator control unit are connected with the hydraulic actuator through a hydraulic pipeline, the energy accumulator control unit comprises an energy accumulator and an energy accumulator control valve block used for regulating and controlling the flow and pressure of hydraulic oil entering and exiting from the energy accumulator, and the local electro-hydraulic control unit is connected with the energy accumulator through the energy accumulator control unit. According to the single-action multi-rotation electro-hydraulic execution device, failure oil supply of the energy accumulator is guaranteed to be emergency and reliable, and the single-action multi-rotation electro-hydraulic execution device is suitable for multiple specifications; the hydraulic lock prevents oil liquid from intruding by mistake and ensures operation safety; a hydraulic actuator and a gear box are combined to optimize the structure; the integrated control unit improves the overall integration level, reduces the cost, energy consumption and fault rate, and enhances the stability and universality.

Description

TECHNICAL FIELD

[0001] The utility model relates to ship valve remote control technical field and especially relates to a single action multi-rotation electro-hydraulic actuator. BACKGROUND

[0002] In the field of shipbuilding industry, the precise control of multi-rotation valves plays a crucial role in the safe operation of ships and the smooth development of various operation processes. The traditional driving system often exposes many defects when dealing with the scene of multi-rotation valve failure opening or closing. With the continuous development and upgrading of ship technology, the reliability and emergency handling capacity of valve control have put forward more stringent requirements.

[0003] Currently, hydraulic transmission, mechanical transmission and electrical control technology have made significant progress in their respective fields, but the system that organically integrates the three and realizes efficient collaborative work in multi-rotation valve control still needs to be improved. Especially in the case of power failure, there is a lack of a driving system that can stably and quickly drive the multi-rotation valve to perform failure opening or closing operation. This not only may cause delay in key operation links of the ship, but also may pose a serious threat to the overall safety of the ship. Therefore, developing a single-acting multi-rotation electro-hydraulic actuator specifically for ship multi-rotation valves that can realize emergency driving under power failure and other extreme conditions has become a key technical problem to be solved in the shipbuilding industry, which has extremely important practical significance for improving the intelligent level and emergency protection capacity of ship valve control. SUMMARY

[0004] To solve the above technical problems, the present application provides a single-acting multi-rotation electro-hydraulic actuator to solve the deficiencies of traditional multi-rotation actuators in failure emergency opening and closing, improve the reliability and safety of the actuator, and achieve the goals of compact structure and high integration.

[0005] The utility model provides a single action multi-rotation electro-hydraulic actuator, which comprises a hydraulic actuator, a gear box, a local electro-hydraulic control unit and an accumulator control unit. The hydraulic actuator is connected with the gear box and is used to convert linear motion into multi-rotation motion of the output shaft of the gear box. The local electro-hydraulic control unit and the accumulator control unit are connected with the hydraulic actuator through a hydraulic pipeline. The accumulator control unit comprises an accumulator and an accumulator control valve block for regulating the flow and pressure of hydraulic oil entering and leaving the accumulator. The local electro-hydraulic control unit is connected with the accumulator through the accumulator control unit.

[0006] Further, the accumulator control unit further comprises a bracket and an actuator control valve block, the accumulator is installed on one side of the bracket, and the accumulator control valve block is connected with the hydraulic actuator through the actuator control valve block. The bracket is arranged, so that the stable installation of the accumulator and the related control valve block and the orderly conveying of hydraulic oil are ensured, and the system stability is improved.

[0007] Further, the accumulator control valve block comprises a pressure switch and a solenoid valve, and the pressure switch is used for controlling the opening of the solenoid valve. Through the design of the pressure switch and the solenoid valve, the precise and automatic control of the oil charging and discharging process of the accumulator is realized, and the stable pressure of the accumulator is maintained.

[0008] Further, the hydraulic actuator is fixed to the other side of the bracket through a gear box. The design enhances the compactness and stability of the overall structure, and optimizes the space layout.

[0009] Further, the hydraulic actuator is fixed to the other side of the bracket through a gear box. The design enhances the compactness and stability of the overall structure, and optimizes the space layout.

[0010] Further, the hydraulic actuator comprises gear shafts and gear racks which are meshed with each other and a cylinder barrel provided with a piston, the gear rack is connected with the piston, and the conversion between linear motion and rotary motion is realized. Through the design, the conversion between linear motion and rotary motion with a certain swing angle is effectively realized, and a power basis is provided for valve driving.

[0011] Further, the gear box comprises a gear transmission assembly, an output shaft and an input shaft connected with the hydraulic actuator, and the input shaft is in transmission connection with the output shaft through the gear transmission assembly. The design of the transmission assembly ensures the power transmission and realizes the adjustment of the rotation speed and the torque at the same time, so that the valve control requirement is met.

[0012] Further, the gear transmission assembly comprises first and second gears which are connected with the input shaft and the output shaft respectively, and the first gear drives the second gear to rotate. The first and second gears realize stable power speedup or speed reduction through gear meshing, so that the accuracy of valve action is ensured.

[0013] Further, the gear box further comprises a valve position window, and the valve position window is arranged above the output shaft. The arrangement of the valve position window facilitates the observation of the valve position state, and assists equipment operation monitoring and maintenance.

[0014] Further, the device further comprises a valve position indicator, and the valve position indicator is arranged on the upper surface of the hydraulic actuator. The arrangement of the valve position indicator can observe and display the valve position, so as to provide real-time feedback for the operator and facilitate accurate control.

[0015] Compared with the prior art, the beneficial results of the utility model lie in that:

[0016] 1. The accumulator control unit failure oil supply mechanism effectively solves the problem of the traditional spring type single-acting electric multi-rotation electro-hydraulic actuator in the case of a long actuator cylinder, ensuring stable driving of the valve to open or close in the case of power failure or other fault conditions, greatly enhancing the reliability and safety of the system in emergency situations, and reducing the safety risks caused by uncontrolled valve.

[0017] 2. The actuator part hydraulic lock function added in the accumulator control unit successfully prevents the oil in the hand pump from entering the local electro-hydraulic power unit when operating the actuator switch valve with the hand pump, effectively avoiding damage to the local electro-hydraulic power unit caused by oil mixing or contamination, ensuring stable operation of the system in different operating modes and safe use of the equipment.

[0018] 3. The innovative use of a hydraulic actuator combined with a gear box design significantly reduces leakage and the required hydraulic oil flow compared to traditional hydraulic motor structures, allowing the use of smaller local electro-hydraulic control units, which not only reduces equipment costs and energy consumption, but also reduces maintenance work and potential failure risks caused by leakage, while the overall structure is more compact and smaller in size, making it easier to install, debug and maintain, improving the space utilization and overall performance of the equipment.

[0019] 4. The high integration of the local electro-hydraulic control unit and the accumulator control unit greatly improves the integration level of the entire device, reduces the number of external connection pipelines and components, simplifies the system structure, reduces the system complexity and failure rate, enhances the stability and reliability of the system, and also facilitates production, transportation and on-site installation and debugging, improving production efficiency and the convenience of engineering implementation.

[0020] 5. By changing the volume of the accumulator, it can be flexibly adapted to various specifications of single-acting electric multi-rotation electro-hydraulic actuators, widening the application range of the utility model, improving its versatility and adaptability in different engineering scenarios, and reducing the cost and time input for redesign and research and development of different specifications of actuators. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and serve to explain principles of the present utility. Many of the anticipated advantages of the utility model embodiments and other embodiments will be readily appreciated as the same become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

[0022] Figure 1is the general assembly view of the single-acting multi-rotation electro-hydraulic executing device according to the utility model;

[0023] Figure 2 is the structure view of the accumulator control unit according to the utility model;

[0024] Figure 3 is the assembly view of the hydraulic actuator and gear box according to the utility model;

[0025] Figures 4a-4b is the perspective view and A-A direction section view of the hydraulic actuator according to the utility model;

[0026] Figures 5a-5c is the overhead view, B-B direction section view and C-C direction section view of the hydraulic actuator and gear box assembly according to the utility model;

[0027] Figure 6 is the hydraulic principle architecture view of the single-acting multi-rotation electro-hydraulic executing device according to the utility model.

[0028] The meaning of each number in the figure: 100 - valve position indicator, 200 - hydraulic actuator, 300 - gear box, 400 - local electro-hydraulic control unit, 500 - accumulator control unit, 600 - hydraulic oil pipe, 201 - base body, 202 - gear shaft, 203 - rack, 204 - oil cylinder barrel, 205 - output shaft hole, 301 - bottom plate, 302 - cover plate, 303 - input shaft, 304 - bearing, 305 - valve position window, 306 - output shaft, 307 - first gear, 308 - second gear, 501 - accumulator control valve block, 502 - actuator control valve block, 503 - accumulator, 504 - support, 5011 - electromagnetic valve, 5012 - pressure switch, 5021 - hydraulic lock. DETAILED DESCRIPTION

[0029] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration illustrative embodiments in which the utility model can be practiced. For purposes of explanation and illustration, directional terms are used with reference to the orientation of the described figures. Because components of embodiments can be positioned in a number of orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments can be utilized and logical changes can be made without departing from the scope of the utility model. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the utility model is defined by the appended claims.

[0030] The utility model provides a single-acting multi-rotation electro-hydraulic executing device, reference Figure 1 , Figure 1The utility model discloses a total assembly drawing of multi-rotation electro-hydraulic executing device is shown, as shown, single -action multi -rotation electro -hydraulic executing device includes hydraulic actuator 200, gear box 300, local electro -hydraulic control unit 400, energy accumulator control unit 500 and valve position indicator 100, wherein, valve position indicator 100 is installed on the easily observed position of the upper surface of hydraulic actuator 200, is used for the intuitive display of the current position state of valve, provides real -time feedback for operating personnel. Hydraulic actuator 200 is closely connected with gear box 300, is the core part of power transmission and conversion, is used for converting linear motion into the multi-rotation motion of gear box 300 output shaft. Local electro -hydraulic control unit 400 and energy accumulator control unit 500 are installed respectively in the side of hydraulic actuator 200 and are connected with hydraulic actuator 200 through hydraulic pipeline, and energy accumulator control unit 500 includes energy accumulator 503 and the energy accumulator control valve block 501 for the flow and pressure of the hydraulic oil in and out energy accumulator 503, and local electro -hydraulic control unit 400 is connected with energy accumulator 503 through energy accumulator control unit 501.

[0031] In specific embodiments, the installation mode of local electro-hydraulic control unit 400 is horizontal, which is composed of an outer cover, a bottom plate, a power unit assembly, a control circuit board, a wiring terminal, an encoder, an emergency joint and a capacitor, etc. After the control system output switch signal of the assembly, the motor drives the gear pump output shaft to rotate, so that the hydraulic oil in the oil tank enters the cavity of the hydraulic actuator 200 through the internal oil circuit, pushes the hydraulic piston to move linearly, drives the valve to act, and the valve position indicator 100 monitors the valve state in real time. When the valve is fully open or fully closed, its feedback signal is transmitted to the circuit board, the motor power is cut off and the valve "open" or "close" signal is sent to the control cabinet, realizing precise control of the whole system. For the internal structure of local electro-hydraulic control unit 400, please refer to the related patent with publication number CN214146079 U. Its internal structure belongs to the prior art and will not be described in detail here.

[0032] Continue to refer to Figure 2 , Figure 2The diagram shows the structure of the accumulator control unit of this invention. As shown, the accumulator control unit 500 includes an accumulator control valve block 501, an actuator control valve block 502, a bracket 504, and an accumulator 503 mounted on one side of the bracket 504. The hydraulic actuator 200 is fixed to the other side of the bracket 504 via a gearbox 300. The bracket 504 provides stable mounting support for the accumulator 503, the hydraulic actuator 200, and the gearbox 300, ensuring that they do not shift or shake during operation, thus guaranteeing the reliability of the overall device. The accumulator control valve block 501 is connected to the hydraulic actuator 200 through the actuator control valve block 502, and is connected to the accumulator 503 through the oil pipe 600. It is used to precisely control the flow and pressure of hydraulic oil entering and leaving the accumulator 503 to ensure the safety and stability of the energy storage process. The accumulator control valve block 501 is equipped with a solenoid valve 5011 and a pressure switch 5012. The solenoid valve 5011 serves as an interface component between the electrical control and the hydraulic system. It receives electrical signals from the control system and switches the hydraulic oil circuit by changing the position of the valve core, thereby realizing the automated control of the energy storage and oil supply process. Pressure switch 5012 is used to monitor the hydraulic oil pressure inside accumulator 503 in real time. When the pressure reaches the set upper limit, pressure switch 5012 sends a signal to solenoid valve 5011, causing solenoid valve 5011 to actuate and stop charging accumulator 503 with oil. When the pressure drops to the set lower limit due to leakage or other reasons, pressure switch 5012 will trigger solenoid valve 5011 again, causing it to switch the oil circuit and restart charging accumulator 503 with oil, thereby maintaining the pressure inside accumulator 503 within a stable range. Actuator control valve block 502 is responsible for controlling the path of hydraulic oil flow to hydraulic actuator 200. It switches the direction of hydraulic oil flow according to different system working states (such as normal operation, emergency operation, etc.) to achieve precise control of hydraulic actuator 200. The hydraulic lock 5021 is installed inside the actuator control valve block 502. Its main function is to prevent the hydraulic oil in the hand pump tank from flowing back into the local electro-hydraulic control unit 400 when the hydraulic actuator 200 is operated by the hand pump, so as to avoid damage to the local electro-hydraulic control unit 400 and ensure the safety of the system.

[0033] Specifically, under normal operating conditions, the hydraulic oil output from the drive motor pump unit by the local electro-hydraulic control unit 400 enters the accumulator 503 through the accumulator control valve block 501 for energy storage. As the energy storage process proceeds, the pressure inside the accumulator 503 gradually increases. When the pressure reaches the upper limit set by the pressure switch 5012, the pressure switch 5012 closes, sending an electrical signal to the solenoid valve 5011. The solenoid valve 5011 then actuates, changing the oil circuit and preventing hydraulic oil from entering the accumulator 503, thus stopping the energy storage process. When the system requires actuator operation, the local electro-hydraulic control unit 400 controls the drive motor pump unit to rotate forward or reverse according to control commands, delivering hydraulic oil to the hydraulic actuator 200 through the actuator control valve block 502 to achieve valve opening or closing operations. In the event of actuator failure, such as when the local electro-hydraulic control unit 400 is de-energized, the solenoid valve 5011 will also be de-energized. At this time, the hydraulic oil stored in the accumulator 503 will flow to the hydraulic actuator 200 through the actuator control valve block 502 under its own pressure, providing emergency power to the hydraulic actuator 200 and driving the actuator to perform emergency opening or closing operations of the valve.

[0034] Further reference Figure 1 , Figure 3 And Figure 4, Figure 3 This invention relates to the assembly diagram of the hydraulic actuator and gearbox of this utility model. Figure 4a and Figure 4b A perspective view and a cross-sectional view along the AA direction are shown for the hydraulic actuator. As shown, the hydraulic actuator 200 includes a base 201 and a gear shaft 202, a rack 203, a cylinder barrel 204, and an output shaft hole 205 disposed inside the base 201. The base 201 of the hydraulic actuator 200 is tightly fixed to the cover plate 302 of the gearbox 300 by bolts and other connecting parts, forming a stable integral structure. The base 201 serves as the main frame of the hydraulic actuator 200, providing a mounting base for other components. The gear shaft 202 meshes with the rack 203, and the gear shaft 202 is connected to the input shaft 303 of the gearbox 300 through the output shaft hole 205. A piston is disposed inside the cylinder barrel 204, and the piston is connected to the rack 203. Under the pressure of hydraulic oil, the piston inside the cylinder barrel 204 moves linearly along the axial direction of the cylinder barrel 204. The linear motion of the piston drives the rack 203 connected to it to move synchronously. The rack 203 meshes with the gear shaft 202, thereby converting the linear motion of the rack 203 into the rotational motion of the gear shaft 202. The rotational motion of the gear shaft 202 is transmitted to the external transmission component gearbox 300 through the output shaft hole 205, thereby realizing the control operation of the valve.

[0035] Continue to refer to Figure 1 , Figure 3 And Figure 5, Figures 5a- Fig. 5cThe figures show a top view, a BB-direction sectional view, and a CC-direction sectional view of the hydraulic actuator and gearbox assembly of this utility model. As shown, the gearbox 300 includes a base plate 301, a cover plate 302, an input shaft 303, a valve position window 305, an output shaft 306, and a gear transmission assembly. The gear transmission assembly includes a first gear 307 and a second gear 308 connected to the input shaft 303 and the output shaft 306, respectively. The first gear 307 drives the second gear 308 to rotate. The base plate 301 and the cover plate 302 provide a stable outer shell structure for the gearbox 300, ensuring the stability and safety of the internal components during operation. The valve position window 305 is a transparent cover located above the output shaft 306. The input shaft 303 passes through the cover plate 302 of the gearbox 300 and is connected to the gear shaft 202 via the output shaft hole 205 and bearing 304. As a key component for power transmission, the input shaft 303 is located on one side of the gearbox 303, with one end connected to the hydraulic actuator 200. It receives power from the hydraulic actuator and transmits the power to the output shaft 306 via the first gear 307 and the second gear 308 of the gear transmission assembly. The output shaft 306 is located on the other side of the gearbox 300 and is connected to the output valve stem via an internal output valve hole 3061. Preferably, the first gear 307 and the second gear 308 are cylindrical gears.

[0036] Specifically, the piston in the cylinder 204 inside the hydraulic actuator 200 generates linear motion under the action of hydraulic oil. This linear motion is transmitted to the gear shaft 202 through the rack 203, causing the gear shaft 202 to rotate. The rotation of the gear shaft 202 drives the input shaft 303 to rotate, and the speed and torque are adjusted through the transmission connection of the first gear 307 and the second gear 308 in the gear transmission assembly. Finally, the output shaft 306 drives the output valve stem to rotate multiple times, realizing the control operation of the valve.

[0037] In specific embodiments, please continue to refer to Figure 6 , Figure 6 The following is a hydraulic principle architecture diagram of the single-acting multi-turn electro-hydraulic actuator of this utility model, as shown in the diagram. Figure 6As shown, under normal operating conditions, the motor-pump unit equipped with the local electro-hydraulic control unit 400 starts operating, drawing hydraulic oil from the oil tank and precisely delivering it to the corresponding chamber of the hydraulic actuator 200 via hydraulic pipelines according to control commands. When a valve opening operation command is issued, the motor-pump unit rotates forward, and hydraulic oil flows into the specific chamber of the hydraulic actuator 200, driving the piston to produce displacement movement, thereby realizing the valve opening process; when a valve closing command is received, the motor-pump unit reverses, and the hydraulic oil flows in the reverse direction, causing the hydraulic actuator 200 to drive the valve to complete the closing action. During the process of delivering hydraulic oil to the hydraulic actuator 200, some hydraulic oil flows into the accumulator 503 through the accumulator control valve block 501 to achieve energy storage. The pressure switch 5012 in the accumulator control unit 500 monitors the internal pressure of the accumulator 503 in real time. Once the pressure reaches a preset threshold, the pressure switch 5012 immediately triggers the solenoid valve 5011 to change the flow path of the hydraulic oil and terminate the oil filling process of the accumulator 503. When the system encounters a malfunction (such as a power outage) that prevents the local electro-hydraulic control unit 400 from operating normally, the solenoid valve 5011 is de-energized. Its valve core returns to its initial position under the action of a spring, thus establishing a connection between the hydraulic line between the accumulator 503 and the hydraulic actuator 200. At this time, the hydraulic oil stored in the accumulator 503 flows rapidly to the hydraulic actuator 200 under its own pressure, providing emergency power support to drive the valve to perform emergency opening or closing operations, effectively ensuring the safety and reliability of the system in emergency situations.

[0038] Preferably, the actuator control valve block 502 is equipped with a hydraulic lock 5021, which is located at a critical node in the hydraulic oil passage. When the system is in a working mode where the hydraulic actuator 200 is not driven by the local electro-hydraulic control unit 400 (such as when driven by a hand pump), the hydraulic lock 5021 can effectively prevent external hydraulic oil from flowing back into the hydraulic circuit of the local electro-hydraulic control unit 400, avoiding potential damage to the precision hydraulic components inside the local electro-hydraulic control unit 400. At the same time, it maintains the pressure stability of the entire hydraulic system, ensuring that the safety and stability of the system are not affected during the switching of different operating modes, and further improving the overall reliability and adaptability of the single-acting multi-turn electro-hydraulic actuator.

[0039] This invention utilizes an accumulator control unit to supply oil for emergency opening or closing when the control unit fails, avoiding the problem of excessively long cylinders in spring-loaded single-acting multi-turn electro-hydraulic actuators. Furthermore, by changing the accumulator volume, it can accommodate various valve specifications, offering strong versatility. The accumulator control unit incorporates a hydraulic lock function, preventing accidental oil entry into the local electro-hydraulic power unit during hand pump operation, thus improving system safety and reliability. The combination of the hydraulic actuator and gearbox results in low leakage and a small required hydraulic oil flow, allowing for the use of a smaller local electro-hydraulic control unit. This avoids some problems associated with hydraulic motor structures, reducing costs, while also providing a compact structure, small size, and ease of installation and use. The integration of the local electro-hydraulic control unit and the accumulator control unit results in a high degree of integration, reducing external connecting pipes and components, and improving system stability and reliability.

[0040] Obviously, those skilled in the art can make various modifications and changes to the embodiments of this utility model without departing from the spirit and scope of this utility model. In this way, this utility model is also intended to cover such modifications and changes if they fall within the scope of the claims of this utility model and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not indicate that a combination of these measures cannot be used for profit. Any reference numerals in the claims should not be considered as limiting the scope.

Claims

1. A single-acting, multi-rotation electro-hydraulic actuator, characterized in that, It includes a hydraulic actuator, a gearbox, a local electro-hydraulic control unit, and an accumulator control unit. The hydraulic actuator is connected to the gearbox and is used to convert linear motion into multi-rotational motion of the gearbox output shaft. The local electro-hydraulic control unit and the accumulator control unit are connected to the hydraulic actuator through hydraulic lines. The accumulator control unit includes an accumulator and an accumulator control valve block for regulating the flow and pressure of hydraulic oil entering and leaving the accumulator. The local electro-hydraulic control unit is connected to the accumulator through the accumulator control unit.

2. The single-acting multi-rotation electro-hydraulic actuator according to claim 1, characterized in that, The accumulator control unit also includes a bracket and an actuator control valve block. The accumulator is mounted on one side of the bracket, and the accumulator control valve block is connected to the hydraulic actuator through the actuator control valve block.

3. The single-acting multi-rotation electro-hydraulic actuator according to claim 1 or 2, characterized in that, The accumulator control valve block includes a pressure switch and a solenoid valve, wherein the pressure switch is used to control the opening of the solenoid valve.

4. The single-acting multi-rotation electro-hydraulic actuator according to claim 2, characterized in that, The hydraulic actuator is fixed to the other side of the bracket via the gearbox.

5. The single-acting multi-rotation electro-hydraulic actuator according to claim 2, characterized in that, The actuator control valve block is equipped with a hydraulic lock.

6. The single-acting multi-rotation electro-hydraulic actuator according to claim 1, characterized in that, The hydraulic actuator includes a meshing gear shaft and a rack, as well as a cylinder with a piston inside. The rack is connected to the piston to realize the conversion between linear motion and rotary motion.

7. The single-acting multi-rotation electro-hydraulic actuator according to claim 1, characterized in that, The gearbox includes a gear transmission assembly, an output shaft, and an input shaft connected to the hydraulic actuator. The input shaft is connected to the output shaft via the gear transmission assembly.

8. The single-acting multi-rotation electro-hydraulic actuator according to claim 7, characterized in that, The gear transmission assembly includes a first gear and a second gear connected to the input shaft and the output shaft, respectively, with the first gear driving the second gear to rotate.

9. The single-acting multi-rotation electro-hydraulic actuator according to claim 7, characterized in that, The gearbox also includes a valve position window, which is located above the output shaft.

10. The single-acting multi-rotation electro-hydraulic actuator according to claim 1, characterized in that, The device also includes a valve position indicator disposed on the upper surface of the hydraulic actuator.

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