Straight-stroke electro-hydraulic execution device

Abstract

The utility model provides a straight stroke electro-hydraulic actuator which comprises an LPU assembly, a hydraulic actuator, a VPI valve position indicator and a communication module, the VPI valve position indicator is installed on a valve and is in communication connection with the LPU assembly through the communication module, the LPU assembly is connected with the hydraulic actuator through an oil way channel, and the LPU assembly provides a power source for the hydraulic actuator; the hydraulic actuator comprises a hydraulic cylinder component, a first oil way and a second oil way. The first oil way and the second oil way are used for communicating an upper hydraulic cavity and a lower hydraulic cavity on the two sides of a piston in the hydraulic cylinder component with an oil way channel of the LPU assembly. The VP I valve position indicator is used for collecting valve blocking information of the valve and transmitting the valve blocking information to the LPU assembly through the communication module. The electro-hydraulic actuating device is simple in structure, small in size, good in environmental adaptability and suitable for various scenes, high positioning precision of the electro-hydraulic linkage actuating mechanism is achieved by means of hydraulic medium characteristics, the valve position indicator is directly connected with the valve, the structure is compact, batch production is facilitated, and wide practicability is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the electromechanical technical field of valve and particularly relates to a straight stroke electro-hydraulic actuator. BACKGROUND

[0002] In many fields of modern industry, effective control of valves plays a crucial role in ensuring the normal operation of various systems. In the shipbuilding industry, complex fuel delivery, cooling circulation, and ballast water regulation systems rely on a large number of valves for precise control, and the special operating environment of ships imposes strict requirements on the stability and space utilization efficiency of valve drive systems. In the field of construction engineering, valves in drainage, heating, ventilation, and air conditioning, and fire protection systems need to respond quickly and accurately under different working conditions, while also considering the impact of operating noise on the surrounding environment. In the field of aerospace, the operating precision of valves in key systems such as aircraft fuel management, hydraulic control, and spacecraft propellant delivery directly affects the success or failure of flight missions, and the equipment needs to adapt to extremely harsh working environments. As a combination of hydraulic transmission and electrical control, electro-hydraulic actuators play an important role in valve driving in the above industries. However, traditional electro-hydraulic actuators still have many shortcomings such as high cost and large size, and need to be improved. SUMMARY

[0003] To solve the above technical problems, the present application provides a straight stroke electro-hydraulic actuator, which aims to efficiently and stably realize the switching operation of a stop valve, optimize the size structure of the actuator product, make it more compact, improve the convenience and reliability of use and maintenance, and effectively reduce the manufacturing cost, to better meet the stringent demands of various industries on valve drive systems.

[0004] The utility model provides a kind of straight stroke electro-hydraulic actuator, the straight stroke electro-hydraulic actuator includes LPU component, hydraulic actuator, VP I valve position indicator and communication module, VP I valve position indicator is installed on valve, is connected with LPU component by communication module, LPU component and hydraulic actuator are connected by oil passage, wherein, LPU component, configuration is generated and controls hydraulic power, provides power source for hydraulic actuator;Hydraulic actuator includes hydraulic cylinder component, first oil passage and second oil passage, first oil passage and second oil passage are used to connect the upper hydraulic chamber, lower hydraulic chamber of piston in hydraulic cylinder component and the oil passage of LPU component respectively;VP I valve position indicator, configuration is collected in valve, and valve block information is transmitted to LPU component by communication module.

[0005] In the above technical solution, through the cooperative work of each component, accurate, stable and efficient control of the valve is realized, which can adapt to various complex working conditions, improve the automation and precision of valve control in industrial production process, ensure the safe and reliable operation of the system, effectively reduce the labor cost and the risk of failure caused by improper valve control, and improve the production efficiency and product quality.

[0006] Further, the LPU component includes a power adapter plate, and the hydraulic actuator is connected with the LPU component through the oil passage by the power adapter plate. The setting of the power adapter plate ensures the stability and sealing of the oil passage connection between the hydraulic actuator and the LPU component, reduces the risk of hydraulic oil leakage, optimizes the power transmission efficiency, and enhances the structural stability of the entire execution device.

[0007] Further, the LPU component further includes a signal connector, and the VPI valve position indicator is electrically connected with the signal connector through a communication module. The presence of the signal connector establishes a reliable electrical connection channel between the VPI valve position indicator and the LPU component, ensures the accurate and rapid transmission of valve position information, and enables the LPU component to adjust the hydraulic power output in a timely manner according to the valve state, thereby improving the real-time performance and accuracy of valve control.

[0008] Further, the hydraulic cylinder component includes a piston, a hydraulic cylinder, and an upper hydraulic rod and a lower hydraulic rod fixedly connected with the piston, and the LPU component controls the reciprocating motion of the piston in the hydraulic cylinder through oil operation. The setting of the hydraulic cylinder component enables it to efficiently convert hydraulic energy into mechanical energy under the driving of the oil of the LPU component, realizes stable reciprocating motion of the piston, and provides strong and accurate power support for opening and closing of the valve.

[0009] Further, the hydraulic cylinder component further includes a steel pipe, a hydraulic upper valve block and a hydraulic lower valve block, and the inner portions of the hydraulic upper valve block and the hydraulic lower valve block are respectively provided with an upper oil passage main channel and a lower oil passage main channel I. The upper oil passage main channel, the steel pipe and the lower oil passage main channel I constitute a first oil passage.

[0010] Further, the hydraulic lower valve block is further provided with a lower oil passage main channel II, which is used to connect the lower hydraulic cavity and the LPU component and constitutes a second oil passage.

[0011] In the above technical solution, the setting of the first oil passage and the second oil passage realizes the circulation path of the hydraulic oil between the actuator and the LPU component, realizes accurate oil supply and oil return control of the upper and lower hydraulic cavities, and the second oil passage works with the first oil passage to ensure the pressure balance and stability of the hydraulic cavities on both sides of the piston, improve the controllability and stability of the piston motion, effectively avoid the problems of piston jamming and shaking caused by poor oil passage or uneven pressure, and improve the reliability and accuracy of valve control.

[0012] Further, the hydraulic actuator further comprises a buffering component for adjusting stroke and flow rate, the buffering component comprising a throttle valve arranged on the upper hydraulic valve block and a limiting block arranged on the upper hydraulic rod.

[0013] Further, the hydraulic actuator further comprises an LPU conversion connecting plate, a valve connecting plate, and a pressure measuring connector and a hydraulic plug arranged on the upper hydraulic valve block and / or the lower hydraulic valve block, the LPU conversion connecting plate being connected with a power conversion plate of the LPU assembly.

[0014] Further, the hydraulic actuator is further provided with an emergency hand pump.

[0015] Further, the VPI valve position indicator comprises an angular stroke swing part and a stroke leading part for fixed connection with the valve, the angular stroke swing part being connected with the stroke leading part through a waist-shaped hole and a thread, for converting linear movement information of the stroke leading part into angular information.

[0016] Compared with the prior art, the beneficial results of the utility model lie in that:

[0017] 1. The utility model overcomes the large size problem of traditional multi-rotation electro-hydraulic actuators, significantly reduces the product size, reduces the manufacturing cost, improves the safety of the production site, facilitates the installation operation, and solves the defects of high cost and large size of traditional straight stroke actuators.

[0018] 2. The signal structure is designed between the actuator and the valve, compared with other straight stroke electro-hydraulic actuators, the overall structure is more compact, the product consistency and practicability are improved, and batch production is facilitated.

[0019] 3. The structure is simple and has strong environmental adaptability, and is suitable for various scenes.

[0020] 4. The valve position indicator adopts a direct connection valve installation method, further optimizes the compactness of the structure, improves the reliability of the equipment, provides convenience for large-scale production, expands the application range and market prospect, and ensures accurate control.

[0021] 5. In the event of such an extreme situation of "three breaks" (power off, gas off, liquid off), the valve electro-hydraulic actuator can realize the opening or closing operation of the valve through the portable emergency hand pump, provide the possibility of emergency access to the regulating device, greatly improve the emergency handling capacity and reliability of the system, and reduce the safety risk and production stagnation loss caused by sudden conditions. BRIEF DESCRIPTION OF DRAWINGS

[0022] 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 the purpose of explaining principles of the present application. Numerous anticipated advantages of the embodiments and other embodiments will be readily appreciated as the same become better understood by reference to the following detailed description. Elements of the drawings are not necessarily to scale. Like reference numerals designate corresponding similar parts.

[0023] Figure 1 is an application diagram of the straight stroke electro-hydraulic actuator according to the present application;

[0024] Figure 2 is a perspective view of the straight stroke electro-hydraulic actuator according to the present application;

[0025] Figures 3a-3b is a perspective view of the LPU assembly of the straight stroke electro-hydraulic actuator according to the present application and a local enlarged view at C;

[0026] Figures 4a-4c is a perspective view, a right view and a sectional view in the direction of D-D of the hydraulic actuator of the straight stroke electro-hydraulic actuator according to the present application;

[0027] Figures 5a-5b is a perspective view and a top view of the valve position indicator of the straight stroke electro-hydraulic actuator according to the present application;

[0028] Figure 6 is a hydraulic principle diagram of the straight stroke electro-hydraulic actuator according to the present application.

[0029] The meanings of the numbers in the figure are as follows: 100-LPU assembly, 200-hydraulic actuator, 300-VPI valve position indicator, 400-communication module, 500-valve, 101-signal connector, 102-power adapter plate, 103-oil tank, 104-emergency interface, 1021-A hydraulic oil port, 1022-B hydraulic oil port, 201-upper hydraulic rod, 202-limiting block, 203-throttle valve, 204-upper hydraulic valve block, 205-hydraulic cylinder, 206-steel pipe, 207-bolt, 208-lower hydraulic valve block, 209-adaptor, 210-valve connecting plate, 211-pressure measuring connector, 212-hydraulic plug, 213-LPU conversion connecting plate, 214-lower hydraulic rod, 215-piston, 216-emergency joint oil way, 2041-oil buffer oil way, 2042-upper oil way main channel, 2081-lower oil way main channel one, 301-angular stroke swing piece one, 302-angular stroke swing piece two, 303-stroke guide piece, 304-fixed support one, 305-fixed support two. DETAILED DESCRIPTION

[0030] 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 application can be practiced. For purposes of explanation and illustration, directional terms are used with reference to the orientation of the described figures. However, it is to be understood that the embodiments can be practiced in other orientations than those described and shown. The directional terms, such as "top," "bottom," "left," "right," "upper," "lower," and the like, are used to aid in describing the embodiments and are not limiting. It will be appreciated that other embodiments can be utilized and logical changes can be made without departing from the scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined by the appended claims.

[0031] The utility model provides a kind of straight stroke electro-hydraulic executing device, refer to Figure 1 And Figure 2 , Figure 1 And Figure 2The application diagram and the perspective view of the straight stroke electro-hydraulic executing device are shown respectively, as shown in the figure, the straight stroke electro-hydraulic executing device is composed of an LPU assembly 100, a hydraulic actuator 200, a VPI valve position indicator 300 and a communication module 400, the VPI valve position indicator 300 is installed on a valve 500, is in communication connection with the LPU assembly 300 through the communication module 400, the LPU assembly 300 is connected with the hydraulic actuator 200 through an oil passage, wherein the LPU assembly 100 is configured to generate and control hydraulic power, and provides a power source for the hydraulic actuator 200; the hydraulic actuator 200 comprises a hydraulic cylinder component, a first oil passage and a second oil passage, the first oil passage and the second oil passage are respectively used for connecting the upper hydraulic chamber and the lower hydraulic chamber of the piston in the hydraulic cylinder component with the oil passage of the LPU assembly 100; the VPI valve position indicator 300 is configured to collect the valve block information of the valve 500, and transmits the valve block information to the LPU assembly 100 through the communication module 400, so as to realize the opening and closing operation of the straight stroke electro-hydraulic executing device for controlling the valve 500; and the communication module 400 can be a corrugated pipe.

[0032] Further reference is made to Figure 1 -3, Figures 3a-3b The LPU assembly perspective view and the C local enlarged view of the utility model are shown respectively, as shown in the figure, the LPU assembly 100 comprises a signal connector 101, a power adapter plate 102 and an oil tank 103, the signal connector 101 is located at the top side edge of the LPU assembly 100, and is connected with the VPI valve position indicator 300 through the communication module 400, and is used to provide a control signal. The power adapter plate 102 and the oil tank 103 are located at the bottom of the LPU assembly 100, the power adapter plate 102 is located at one side of the oil tank 103, and plays a role of switching and supporting, and is used to connect the hydraulic actuator 200 and the first oil passage and the second oil passage. The power adapter plate 102 is provided with an A hydraulic oil port 1021 and a B hydraulic oil port 1022, and the LPU assembly 100 is connected with the hydraulic actuator 200 through the internal oil passage via the A hydraulic oil port 1021 and the B hydraulic oil port 1022. The A hydraulic oil port 1021 and the B hydraulic oil port 1022 provide hydraulic power for the hydraulic actuator 200.

[0033] Specifically, the installation mode of the LPU assembly is horizontal, which is composed of an LPU cover, an LPU 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 of the LPU assembly outputs a switching signal, the motor drives the gear pump output shaft to rotate, so that the hydraulic oil in the oil tank enters the hydraulic actuator cavity through the internal oil circuit, pushes the hydraulic piston to move linearly, drives the valve to act, and the valve position indicating device monitors the valve state in real time. When the valve is fully open or fully closed, the feedback signal is transmitted to the circuit board, the motor power is cut off, and the "open" or "close" signal of the valve is sent to the control cabinet, so as to realize the precise control of the whole system. As for the internal structure of the LPU assembly, please refer to the related patent with publication number CN 214146079U. The internal structure belongs to the prior art, and will not be described in detail here.

[0034] In a specific embodiment, further in combination with Figure 4, Figures 4a-4c As shown in the figure, the hydraulic actuator 200 comprises an upper hydraulic rod 201, a limiting block 202, a throttle valve 203, a hydraulic upper valve block 204, a hydraulic cylinder 205, a steel pipe 206, a bolt 207, a hydraulic lower valve block 208, an adapter 209, a valve connecting plate 210, a pressure measuring connector 211, a hydraulic plug 212, an LPU conversion connecting plate 213, a lower hydraulic rod 214, a piston 215, and an emergency joint oil circuit 216. Among them, the upper hydraulic rod 201 and the lower hydraulic rod 214 are connected with the piston 215, the piston 215 moves up and down in the hydraulic cylinder 205, and the hydraulic upper valve block 204 and the hydraulic lower valve block 208 control the inlet and outlet of the hydraulic oil. Among them, the hydraulic upper valve block is provided with an oil buffer oil circuit 2041 and an upper oil main passage 2042, the hydraulic lower valve block 208 is provided with a lower oil main passage one 2081 and a lower oil main passage two, respectively, the upper oil main passage 2042, the adapter 209, the steel pipe 206 and the lower oil main passage one 2081 constitute the first oil circuit, and the lower oil main passage two is used for connecting the lower hydraulic cavity and the LPU assembly, and constitutes the second oil circuit. The first oil circuit pipeline composed of the oil buffer oil circuit 2041, the upper oil main passage 2042, the adapter of the hydraulic upper valve block 204, the steel pipe 206, the adapter of the hydraulic lower valve block 208 and the lower oil main passage one 2081 realizes the inlet and outlet of the hydraulic oil in the upper hydraulic cavity on the upper side of the piston 215. The second oil circuit pipeline composed of the lower oil main passage two realizes the inlet and outlet of the hydraulic oil in the lower hydraulic cavity on the lower side of the piston 215.

[0035] Specifically, the buffer component includes a throttle valve 203 arranged on the upper hydraulic valve block 204 and a limiting block 202 arranged on the upper hydraulic rod 211. The throttle valve 203 is used to adjust the flow rate of the oil entering the hydraulic cylinder 205, thereby controlling the movement speed of the hydraulic rod, making the opening and closing actions of the valve 500 more stable and reducing vibration. The limiting block 202 is used to limit the stroke of the hydraulic rod, ensuring that the valve 500 can be accurately opened to the maximum position or closed to the minimum position, avoiding excessive movement. The steel pipe 206 is made of stainless steel and is used to connect the oil passage between the upper hydraulic valve block 204 and the lower hydraulic valve block 208. The upper oil passage main channel 2042 and the lower oil passage main channel 2081 are connected to the steel pipe 206 through the adapter 209. The pressure measuring connector 211 is arranged on the side of the upper hydraulic valve block 204 and the lower hydraulic valve block 208, used to connect the pressure measuring device to monitor the pressure of the hydraulic system. The hydraulic plug 212 is used to close the unnecessary oil passage interface. The LPU conversion connecting plate 213 is connected to the power adapter plate 102, used to transmit hydraulic oil and control signals. The upper hydraulic valve block 204 is also provided with an emergency connector oil passage 216. The valve 500 is connected to the hydraulic actuator 200 through the valve connecting plate 210, and its opening and closing operations are controlled by the hydraulic actuator 200. The lower hydraulic valve block 208 can be assembled with a throttle device as needed to flexibly control the flow. The parts of the hydraulic cylinder component can be individually changed in size to adapt to various specifications of valves in a specific flow range, ensuring the universality of the remaining components, improving the overall adaptability and practicality, facilitating device integration and maintenance and upgrading, reducing cost and inventory pressure, and enhancing market competitiveness.

[0036] Specifically, the assembly process of the hydraulic actuator includes: first, the upper hydraulic rod 201 and the lower hydraulic rod 214 are fixed on the upper and lower sides of the piston 215 respectively through threaded connection (as shown in Figure 4c Secondly, for the upper hydraulic valve block 204, the corresponding adapter 209, pressure measuring connector 211, throttle valve 203 and corresponding hydraulic plug 212 are threaded connected, and sealing rings are installed at the corresponding positions. Thirdly, for the lower hydraulic valve block 208, the corresponding adapter 209, pressure measuring connector 211, LPU conversion connecting plate 213, throttle valve 203 and corresponding hydraulic plug 212 are threaded connected, and sealing rings are installed at the corresponding positions. Finally, the upper hydraulic valve block 204, the hydraulic cylinder 205, the piston 215 with the hydraulic rod, the lower hydraulic valve block 208, the valve connecting plate 210 and the steel pipe 206 are connected through the bolts 207, completing the assembly process of the hydraulic actuator.

[0037] In a specific embodiment, when the motor output shaft in the LPU assembly 100 drives the output shaft of the gear pump to rotate, the hydraulic oil in the oil tank 103 is transported to the A hydraulic oil port 1021 through the internal oil circuit. Then, the oil enters the hydraulic lower valve block 208 through the LPU conversion connecting plate 213, and flows into the lower hydraulic cavity on the lower side of the piston 215 along the internal lower oil circuit main channel two of the hydraulic lower valve block 208, thereby lifting the piston 215. As the piston 215 moves upward, the oil in the upper hydraulic cavity enters the upper oil circuit main channel 2042 of the hydraulic upper valve block 204, and finally returns to the LPU assembly 100 through the B hydraulic oil port 1022 via the adapter of the hydraulic upper valve block 204, the steel pipe 206, the lower oil circuit main channel one 2081 and the LPU conversion connecting plate 213. In this process, the throttle valve 203 in the hydraulic upper valve block 204 acts as a constant throttle type buffer device, which plays a constant throttle buffering role to prevent the piston 215 from impacting the hydraulic upper valve block 204 with great force and causing noise and mechanical structure to move. The two throttle valves in the hydraulic lower valve block 208 play a throttling role, and the throttle valves at this position can be replaced by plugs due to smaller hydraulic impact in the LPU part.

[0038] In a specific embodiment, with continued reference to Figure 2 and FIG. 5, Figures 5a-5b respectively show the perspective view and top view of the valve position indicator of the utility model, as shown in the figure, the VPI valve position indicator 300 is mechanical, which includes an angular stroke swing piece one 301, an angular stroke swing piece two 302 and a stroke guide piece 303 fixed to the valve, the angular stroke swing piece two 302 is connected with the stroke guide piece 303 through a waist-shaped hole and a thread, and is used for converting the linear movement information of the stroke guide piece 303 into angular information. The angular stroke swing piece one 301 and the angular stroke swing piece two 302 are associated with the movement of the hydraulic actuator 200, convert the linear movement of the valve 500 into angular stroke swing and feed back the position signal, and the stroke guide piece 303, the fixed support one 304 and the fixed support two 305 ensure the stability of the VPI valve position indicator 300.

[0039] Specifically, the VPI valve position indicator 300 is mainly used to control the start and stop of the LPU assembly 100. The reciprocating motion of the straight stroke component drives the angular stroke swing component to rotate, and when it swings to the end point, it triggers the switch of the VPI valve position indicator, thereby releasing an electrical signal. After the LPU receives this signal, it performs oil supply opening or stopping operation according to the preset instructions, thereby realizing the control of the opening and closing action of the valve. Among them, the stroke guide 303 is rigidly fixed on the valve through threaded connection, so as to obtain the position information of the valve block of the valve in real time and convert it into a linear displacement signal. The stroke swing component two 302 is assembled with the stroke guide 303 in a combination of a waist-shaped hole and a threaded connection, which can convert the linear movement information of the stroke guide 302 into angular change information through a specific mechanical structure, thereby realizing the conversion of the signal form. Subsequently, the angular stroke swing component one 301 further accurately feeds back the angle information to the indicator through a precise mechanical structure. The indicator releases an electrical signal in time after receiving the feedback information according to the built-in contact switch mechanism, and the electrical signal is stably transmitted through the bellows to ensure the reliability and accuracy of signal transmission. In this process, the fixed support one 304 and the fixed support two 305 play a crucial role. They provide a stable support structure to ensure that the VPI valve position indicator 300 maintains a stable installation state during operation, avoiding the influence of external vibration or impact on the accuracy of signal acquisition and transmission, thereby ensuring the accurate realization of the valve position indication and control function.

[0040] In a specific embodiment, with continued reference to Figure 6 , Figure 6 The hydraulic principle diagram of the straight stroke electro-hydraulic execution device of the utility model is shown, as Figure 6 shown, when the valve is in an open state, the LPU assembly 100 provides power for the hydraulic actuator 200. The LPU assembly 100 contains key components such as a hydraulic pump and a motor inside, is provided with two emergency joints 104, and is connected with the internal oil circuit of the hydraulic lower valve block 208 of the hydraulic actuator 200 through the A hydraulic oil port 1021 and the B hydraulic oil port 1022, to realize the transmission of hydraulic oil. The hydraulic actuator 200 controls the opening and closing of the valve by relying on the received hydraulic power. The VPI valve position indicator 300 is used to indicate the position state of the valve.

[0041] Specifically, when receiving the signal of closing the valve, hydraulic oil flows out from the LPU assembly, enters through the first oil path of the hydraulic lower valve block, and sequentially passes through the lower oil path main channel one, the adapter of the hydraulic lower valve block, the steel pipe and the upper oil path main channel, enters the inside of the upper hydraulic cavity of the hydraulic cylinder, and drives the hydraulic piston to move linearly downward. In this process, the hydraulic oil at the lower end of the piston flows out of the actuator along the second oil path of the hydraulic lower valve block, i.e. the lower oil path main channel two, and finally returns to the LPU assembly. When receiving the signal of opening the valve, hydraulic oil flows out from the LPU assembly, flows into the hydraulic cylinder through the second oil path of the hydraulic lower valve block, i.e. the lower oil path main channel two, and drives the hydraulic piston to move linearly upward. At this time, the hydraulic oil at the upper end of the piston flows out of the actuator along the first oil path, and then returns to the LPU, so as to complete the hydraulic driving action of opening and closing the valve, ensure that the valve accurately responds to the control signal, and realize the stable switching of the opening and closing function of the valve.

[0042] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present application without departing from the spirit and scope of the present application. In this way, if these modifications and changes are within the scope of the claims of the present application and their equivalents, the present application also aims to cover these modifications and changes. 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 mean that the combination of these measures cannot be used to advantage. Any reference signs in the claims should not be considered as limiting the scope.

Claims

1. A direct stroke electro-hydraulic actuator, characterized by, The straight stroke electro-hydraulic execution device comprises an LPU assembly, a hydraulic actuator, a VPI valve position indicator and a communication module, the VPI valve position indicator is installed on a valve and is in communication connection with the LPU assembly through the communication module, and the LPU assembly is connected with the hydraulic actuator through an oil passage, The LPU assembly is configured to generate and control hydraulic power and provide a power source for the hydraulic actuator. The hydraulic actuator comprises a hydraulic cylinder component, a first oil passage and a second oil passage, the first oil passage and the second oil passage are respectively used for connecting an upper hydraulic cavity and a lower hydraulic cavity on both sides of a piston in the hydraulic cylinder component with an oil passage of the LPU assembly. The VPI valve position indicator is configured to collect valve block information of the valve and transmit the valve block information to the LPU assembly through the communication module.

2. A direct stroke electro-hydraulic actuator according to claim 1, wherein, The LPU assembly comprises a power adapter plate, and the hydraulic actuator is connected with the LPU assembly through the oil passage through the power adapter plate.

3. The direct stroke electro-hydraulic actuator of claim 1, wherein, The LPU assembly further comprises a signal connector, and the VPI valve position indicator is electrically connected with the signal connector through the communication module.

4. The direct stroke electro-hydraulic actuator of claim 1, wherein, The hydraulic cylinder component comprises the piston, a hydraulic cylinder, an upper hydraulic rod and a lower hydraulic rod fixedly connected with the piston, and the LPU assembly controls the piston to make reciprocating motion in the hydraulic cylinder through oil operation.

5. A direct stroke electro-hydraulic actuator according to claim 4, wherein, The hydraulic cylinder component further comprises a steel pipe, a hydraulic upper valve block and a hydraulic lower valve block, the hydraulic upper valve block and the hydraulic lower valve block are respectively provided with an upper oil passage main channel and a lower oil passage main channel I, and the upper oil passage main channel, the steel pipe and the lower oil passage main channel I constitute the first oil passage.

6. A direct stroke electro-hydraulic actuator as claimed in claim 5, wherein, The hydraulic lower valve block is further provided with a lower oil passage main channel II, the lower oil passage main channel II is used for connecting the lower hydraulic cavity and the LPU assembly, and constitutes the second oil passage.

7. A direct stroke electro-hydraulic actuator as claimed in claim 5, wherein, The hydraulic actuator further comprises a buffer component for adjusting stroke and flow rate, the buffer component comprises a throttle valve arranged on the hydraulic upper valve block and a limiting block arranged on the upper hydraulic rod.

8. A direct stroke electro-hydraulic actuator as claimed in claim 5, wherein, The hydraulic actuator further comprises an LPU conversion connecting plate, a valve connecting plate, a pressure measuring connector arranged on the hydraulic upper valve block and / or the hydraulic lower valve block and a hydraulic plug, and the LPU conversion connecting plate is connected with the power adapter plate of the LPU assembly.

9. The direct stroke electro-hydraulic actuator of claim 1, wherein, The hydraulic actuator is further provided with an emergency hand pump.

10. The direct stroke electro-hydraulic actuator of claim 1, wherein, The VPI valve position indicator comprises an angular stroke swing part and a stroke guide part for fixed connection with the valve, the angular stroke swing part is connected with the stroke guide part through a waist-shaped hole and a thread, and is used for converting linear motion information of the stroke guide part into angular information.

Images