Self-acting double-acting hydraulic actuating structure and method of use thereof

Abstract

The application relates to the field of pipeline fluid safety control, in particular to a self-powered double-acting hydraulic execution structure and a use method thereof, wherein the execution structure comprises a pressurizing assembly, an energy accumulator is connected to the pressurizing assembly, an overflow valve is connected to the energy accumulator, a valve driving piece is further connected to the energy accumulator, and the valve driving piece is used for driving a valve arranged on a pipeline; a pressure relay and a first on-off assembly are connected between the valve driving piece and the energy accumulator, the first on-off assembly is used for controlling the on-off between the overflow valve and the valve driving piece, an alarm is connected to the pressure relay, a pressure sensor is arranged in the pipeline, and the pressure sensor is in communication connection with a controller used for controlling the first on-off assembly. The application has the effect of facilitating the improvement of the execution structure in the prior art on the success rate of pipeline valve control.

Description

Technical Field

[0001] This application relates to the field of pipeline fluid safety control, and in particular to a self-powered double-acting hydraulic actuator and its method of use. Background Technology

[0002] In industrial production, improving the reliability of equipment control systems can effectively reduce economic losses caused by instrument malfunctions. Interlocking control between signals in industrial production systems is a crucial safety guarantee, and valves play an extremely important role in these systems. With the rapid development of science and technology, industrial production places increasingly higher demands on the reliability of process control systems.

[0003] Currently, in many industries, the control and regulation of many pipeline valves requires the use of actuators. Actuators are used to control the opening and closing of pipeline valves, thereby controlling the flow of the pipeline. One type of actuator in the prior art includes an accumulator power supply structure, which is connected to an accumulator. The accumulator is connected to a valve drive structure, which is connected to a valve used to control the opening and closing of the pipeline. In practice, when it is necessary to control the valve to close the pipeline, the accumulator power supply structure can supply energy to the accumulator, thereby providing energy for the valve drive structure to drive the valve, thus enabling the valve drive structure to drive the valve to the closed state.

[0004] In the process of developing this application, it was found that the above-mentioned technology has at least the following problems: when supplying energy to the energy storage device, if the energy provided is too large, it is easy to damage the energy storage device and related structures connected to it, making it difficult to close the valve; if the energy provided is too small, it is not enough for the energy storage device to provide enough energy for the valve drive structure to drive the valve, so that the valve cannot be successfully closed; it is evident that the success rate of the execution structure in the prior art in controlling pipeline valves needs to be improved. Summary of the Invention

[0005] To improve the success rate of control of pipeline valves by the actuators in the prior art, this application provides a self-operated double-acting hydraulic actuator and its usage method.

[0006] The self-powered double-acting hydraulic actuator provided in this application adopts the following technical solution:

[0007] A self-operated double-acting hydraulic actuator includes a pressurizing component, an energy storage device connected to the pressurizing component, an overflow valve connected to the energy storage device, and a valve actuator connected to the energy storage device. The valve actuator is used to drive a valve installed on a pipeline. A pressure relay and a first on / off assembly are connected between the valve actuator and the energy storage device. The first on / off assembly is used to control the opening and closing between the overflow valve and the valve actuator. The pressure relay is connected to an alarm. A pressure sensor is installed in the pipeline, and the pressure sensor is communicatively connected to a controller for controlling the first on / off assembly.

[0008] By adopting the above technical solution, the energy storage device is first pressurized by a pressurizing component. When the pressure in the energy storage device exceeds the first pressure threshold corresponding to the overflow valve, it indicates that the energy in the energy storage device is overloaded. The overflow valve is then open, allowing excess energy to flow out until the pressure in the energy storage device does not exceed the first pressure threshold corresponding to the overflow valve. On the other hand, when the energy in the energy storage device falls below the second pressure threshold corresponding to the pressure relay, it indicates that the energy in the energy storage device is insufficient. The pressure relay immediately controls the alarm to send an alarm signal to the staff, thus facilitating the work. The operator promptly repressurizes the energy storage device using the pressurization unit. When the pressure sensor detects that the pressure in the pipeline is not within the preset threshold range, it indicates that the fluid pressure in the pipeline is not within the normal range. At this time, the pressure sensor controls the first on / off component to be in the open state through the controller, thereby allowing the energy in the energy storage device to enter the valve actuator, which in turn drives the valve to close the pipeline in a timely manner, thus facilitating the prevention of further escalation of pipeline hazards. In summary, the self-operated double-acting hydraulic actuator structure provided in this application improves the success rate of pipeline valve control by existing actuator structures.

[0009] In one specific implementation, the pressurization assembly is connected to a hydraulic oil tank, and the relief valve is also connected to the hydraulic oil tank.

[0010] By adopting the above technical solution, the pressurizing component can easily pressurize the hydraulic oil in the hydraulic oil tank into the energy storage pump. When the pressure of the hydraulic oil in the energy storage device exceeds the preset first pressure threshold, the hydraulic oil will flow out from the overflow valve and flow back into the hydraulic oil tank, thereby facilitating the recycling of hydraulic oil and achieving the goal of saving hydraulic oil.

[0011] In one specific implementation, the pressurization assembly includes a manual pump connected to a manual directional valve, which is connected to a hydraulic lock connected to the accumulator.

[0012] By adopting the above technical solution, when energy is injected into the energy storage device, the manual pump is first connected to the energy storage device through the manual reversing valve, then the hydraulic lock is opened, and then the energy is injected into the energy storage device through the manual pump, which facilitates the charging of the energy storage device.

[0013] In one specific implementation, the first on / off assembly includes a first solenoid valve connected to the energy storage device, the first solenoid valve being communicatively connected to the controller, and a first one-way throttle valve being connected between the first solenoid valve and the oil inlet of the valve actuator.

[0014] By adopting the above technical solution, when the controller determines that the pressure in the pipeline is not within the preset pressure threshold range, it immediately controls the solenoid valve to open, so that the energy in the energy storage device can enter the valve actuator through the solenoid valve, thereby causing the valve actuator to drive the valve to close. The first one-way throttle valve can control the flow rate of energy entering the valve actuator, thereby facilitating the control of the speed at which the valve actuator drives the valve.

[0015] In one specific implementation, the first solenoid valve is connected to an external power source, and the controller is used to control the on / off connection between the first solenoid valve and the external power source.

[0016] By adopting the above technical solution, when the controller determines that the pressure in the pipeline is not within the preset pressure threshold range, the controller controls the connection between the first solenoid valve and the external power supply, thereby energizing the first solenoid valve and putting it in the open state, thus facilitating a method for the controller to control the first solenoid valve.

[0017] In one specific implementation, a second on / off assembly connected to the controller is connected to the oil outlet of the valve actuator, and the second on / off assembly is connected to the hydraulic oil tank.

[0018] By adopting the above technical solution, the controller can open the second opening and closing component while controlling the first opening and closing component to be in the open state. This makes it easier for the hydraulic oil flowing out of the valve drive outlet to be recycled back into the hydraulic oil tank, thereby improving the recycling rate of hydraulic oil.

[0019] In one specific implementation, a first slide valve with a built-in first fusible plug is connected between the energy storage device and the oil inlet of the valve actuator. The fusible plug is used to control the first slide valve to be in a closed state.

[0020] By adopting the above technical solution, when the pipeline temperature rises to a preset temperature threshold due to adverse conditions such as fire, the fusible plug in the first slide valve will melt, thereby opening the first slide valve. This allows the energy in the energy storage device to flow into the valve actuator, which then drives the valve to close, preventing the adverse conditions from escalating further and thus improving the safety of the pipeline.

[0021] In one specific implementation, a second slide valve with a built-in second fusible plug is connected to the oil outlet of the valve actuator, and the second slide valve is connected to a first shut-off valve.

[0022] By adopting the above technical solution, after the valve closing action is completed, the hydraulic oil can be stopped flowing in the valve drive component through the first shut-off valve, which facilitates the valve drive component to stop performing the valve closing action and also helps to prevent the waste of hydraulic oil in the energy storage device.

[0023] In one specific implementation, the first shut-off valve is connected to the hydraulic oil tank.

[0024] By adopting the above technical solution, the hydraulic oil flowing out from the first shut-off valve can be further retained in the hydraulic oil tank, thereby facilitating the recovery of hydraulic oil and improving the recycling rate of hydraulic oil.

[0025] This application also provides a method for using a self-powered double-acting hydraulic actuator, which adopts the following technical solution:

[0026] A method of using a self-powered double-acting hydraulic actuator includes:

[0027] The energy storage device is pressurized by the pressurization component until the overflow valve opens automatically;

[0028] When the pressure relay detects that the energy storage device is below a preset first pressure threshold, the alarm is activated.

[0029] When the pressure sensor detects that the pressure in the pipeline is not within the preset pressure threshold range, the controller controls the first on / off component to be in the open state, thereby causing the valve drive to close the valve.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. Facilitates improving the success rate of control of pipeline valves by the actuator in existing technologies;

[0032] 2. Facilitates improved pipeline safety;

[0033] 3. It facilitates the saving of hydraulic oil and improves the recycling rate of hydraulic oil. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a self-powered double-acting hydraulic actuator in an embodiment of this application.

[0035] Figure 2 This is a flowchart illustrating a method of using a self-powered double-acting hydraulic actuator in an embodiment of this application.

[0036] Explanation of reference numerals in the attached diagram: 1. Hydraulic oil tank; 2. Pressurization assembly; 21. Manual pump; 22. Manual directional valve; 23. Hydraulic lock; 24. Second shut-off valve; 3. Accumulator; 4. Pressure anomaly handling assembly; 41. Third shut-off valve; 42. Pressure gauge; 43. Relief valve; 44. Pressure relay; 45. Alarm; 5. Valve actuator; 6. First on / off assembly; 61. First solenoid valve; 62. First one-way guide valve; 7. Second on / off assembly; 71. Second one-way throttle valve; 72. Second solenoid valve; 8. First spool valve; 9. Third on / off assembly; 91. Second spool valve; 92. First shut-off valve; 93. Fourth shut-off valve. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0038] This application discloses a self-powered double-acting hydraulic actuator. (Refer to...) Figure 1 The self-operated double-acting hydraulic actuator includes a hydraulic oil tank 1, a pressurizing component 2 connected to the hydraulic oil tank 1, an energy storage device 3 connected to the pressurizing component 2, a pressure anomaly handling component 4 connected to the energy storage device 3, and a valve actuator 5 connected to the energy storage device 5. The valve actuator 5 is connected to a valve (not shown in the figure) installed on a pipeline (not shown in the figure). The energy storage device 3 drives the valve actuator 5, thereby causing the valve actuator 5 to drive the valve to close the pipeline. In this embodiment, the pipeline is used to transport fluids such as natural gas or oil. A pressure sensor (not shown in the figure) is installed in the pipeline, and the pressure sensor is communicatively connected to a controller (not shown in the figure). A first on / off assembly 6, electrically connected to the controller, is connected between the energy storage device 3 and the valve actuator 5. The first on / off assembly 6 is used to control the on / off connection between the energy storage device 3 and the valve actuator 5. A second on / off assembly 7, electrically connected to the controller, is connected between the valve actuator 5 and the hydraulic oil tank 1. The second on / off assembly 7 is used to control the on / off connection between the valve actuator 5 and the hydraulic oil tank 1. A first slide valve with a built-in first fusible plug is connected between the energy storage device 3 and the valve actuator 5. A third on / off assembly is connected between the valve actuator 5 and the hydraulic oil tank 1. The third on / off assembly is used to control the on / off connection between the valve actuator 5 and the hydraulic oil tank 1.

[0039] Reference Figure 1The pressurization component 2 includes a manual pump 21 connected to the hydraulic oil tank 1. In this embodiment, the manual pump 21 is specifically a one-way check manual pump. The manual pump 21 is connected to a manual directional valve 22 through a preset pipeline. The manual pump 21 is used to manually pump the hydraulic oil from the hydraulic oil tank 1 into the manual directional valve 22. In this embodiment, the manual directional valve 22 is specifically a three-position manual directional valve. The three-position manual directional valve has three outlets, namely a left outlet, a middle outlet, and a right outlet. By manually driving the three-position manual directional valve, the hydraulic oil can be controlled to flow out from one of the left outlet, the middle outlet, and the right outlet. The manual directional valve 22 is connected to a hydraulic lock 23 through a preset pipeline. The hydraulic lock 23 is connected to a second shut-off valve 24 through a preset pipeline. The second shut-off valve 24 is connected to the aforementioned energy storage device 3 through a preset pipeline.

[0040] In practice, the three-position manual directional valve is first manually driven to select the middle position outlet, then the hydraulic lock 23 and the second shut-off valve 24 are opened, and then the hydraulic oil in the hydraulic oil tank 1 is pumped into the accumulator 3 by manually driving the manual pump 21.

[0041] The pressure anomaly handling component 4 includes a third shut-off valve 41 connected to the second shut-off valve 24 via a preset pipeline. The third shut-off valve 41 is connected to a pressure gauge 42 via a preset pipeline. When both the second shut-off valve 24 and the third shut-off valve 41 are in the open state, the pressure gauge 42 is used to display the pressure data in the energy storage device 3. The second shut-off valve 24 is connected to an overflow valve 43 via a preset pipeline, and the overflow valve 43 is connected to the hydraulic oil tank 1 via a preset pipeline. The second shut-off valve 24 is connected to a pressure relay 44 via a preset pipeline, and the pressure relay 44 is electrically connected to an alarm 45. In this embodiment, the alarm 45 can be one or more of the following: an audible alarm, a visual alarm, an audible and visual alarm, and a signal alarm that communicates with a smart device carried by the staff. It should be noted that the overflow valve 43 is preset with a first pressure threshold corresponding to the maximum pressure that the energy storage device 3 can withstand. That is, when the pressure at the overflow valve 43 reaches the first pressure threshold, the overflow valve 43 will change from a closed state to a conducting state. It should also be noted that the pressure relay 44 is used to detect the pressure in the energy storage device 3 and is provided with a second pressure threshold. The second pressure threshold corresponds to the situation where the pressure in the energy storage device 3 is too low to drive the valve actuator 5.

[0042] In implementation, hydraulic oil in the hydraulic tank 1 is pumped into the accumulator 3 by the pressurizing component 2 until hydraulic oil flows out of the overflow valve 43 and into the hydraulic tank 1. At this time, the pressure in the accumulator 3 is greater than the first pressure threshold as determined by the pressure gauge 42. Each time the accumulator 3 drives the valve actuator 5, a portion of the hydraulic oil stored in the accumulator 3 flows to the valve actuator 5. It should be noted that in this embodiment, the valve actuator 5 is a cylinder assembly used to drive the valve to open and close the pipeline, which is a structure in the prior art, and its specific structure will not be described in detail. As the number of times the accumulator 3 drives the valve actuator 5 increases, the amount of hydraulic oil in the accumulator 3 continuously decreases, resulting in a continuous decrease in the pressure in the accumulator 3. When the pressure relay 44 detects that the pressure in the accumulator 3 is lower than the preset second pressure threshold, the alarm 45 is immediately activated to send an alarm signal to the staff so that the staff can pump hydraulic oil into the accumulator pump again. It should be noted that since the overflow valve 43 is connected to the hydraulic oil tank 1 through a preset pipeline, the hydraulic oil flowing out of the overflow valve 43 can further flow into the hydraulic oil tank 1, which not only helps to prevent the waste of hydraulic oil, but also helps to increase the recycling rate of hydraulic oil.

[0043] The first on / off assembly 6, connecting the energy storage device 3 and the valve actuator 5, includes a first solenoid valve 61 connected to the second shut-off valve 24 via a preset pipeline, and a pressure relay 44 connected to the preset pipeline between the second shut-off valve 24 and the first solenoid valve 61; the first solenoid valve 61 is connected to a first one-way flow guide valve 62 via a preset pipeline, and the first one-way flow guide valve 62 is connected to the oil inlet of the valve actuator 5 via a preset pipeline; the oil outlet of the valve actuator 5 is connected to a second on / off assembly 7, which includes a second one-way throttle valve 71 connected to the oil outlet of the valve actuator 5 via a preset pipeline, and the second one-way throttle valve 71 is connected to a second solenoid valve 72 via a preset pipeline, and the second solenoid valve 72 is connected to the hydraulic oil tank 1 via a preset pipeline; the first solenoid valve 61 and the second solenoid valve 72 are both connected to an external power supply (not shown in the figure) and a controller (not shown in the figure). The controller communicates with the pressure sensor in the pipeline transmitting the fluid and is used to control the power supply between the external power supply and the controller. It should be noted that the controller has a pressure threshold range, with a maximum value of a third pressure threshold and a minimum value of a fourth pressure threshold. The third pressure threshold corresponds to the maximum pressure the pipeline can withstand under safe conditions, and the fourth pressure threshold corresponds to the minimum pressure the pipeline should withstand under safe conditions. If the pressure in the pipeline exceeds the third pressure threshold, it indicates a possible pipeline blockage; if the pressure is less than the fourth pressure threshold, it indicates a possible pipeline leak. It should also be noted that in the initial state, the first and second electromagnetic switches are closed, and both the first and second one-way throttle valves 71 are open.

[0044] In implementation, the pressure sensor detects pressure data and sends it to the controller at a certain frequency. When the controller determines that the pressure data is greater than the third pressure threshold or less than the fourth pressure threshold, the pressure controller immediately controls the first and second electromagnetic switches to be energized by the external power supply, thereby turning the first and second electromagnetic switches on. This allows the high-pressure hydraulic oil in the energy storage device 3 to enter the valve drive component 5, which in turn drives the valve to close the pipeline. This helps prevent further blockage or leakage in the pipeline, thus improving pipeline safety.

[0045] It should be noted that both the first one-way throttle valve and the second one-way throttle valve 71 can control the flow rate of hydraulic oil entering the valve drive 5, thereby facilitating the control of the speed at which the valve drive 5 drives the valve to close. Since both the second one-way throttle valve 71 and the second solenoid valve 72 are in the conducting state when the valve drive 5 drives the valve to close, the hydraulic oil flowing out of the valve drive 5 also flows further into the hydraulic oil tank 1, thereby facilitating the recycling of hydraulic oil and improving the circulation rate of hydraulic oil.

[0046] Continue to refer to Figure 1 The first slide valve is connected between the energy storage device 3 and the oil inlet of the valve drive component 5 through a preset pipeline; the third on / off assembly includes a second slide valve connected to the oil outlet of the valve drive component 5 through a preset pipeline. The second slide valve is connected to a first shut-off valve through a preset pipeline, and the first shut-off valve is connected to the hydraulic oil tank 1 through a preset pipeline. In the initial state, the first medium valve is in the open state. It should be noted that when natural gas or oil leaks and burns in the pipeline, the pipeline temperature will rise, and the heat will be rapidly transferred to the self-operated double-acting hydraulic actuator connected to the pipeline valves, causing the temperature of various components, including the first and second spool valves, to rise. The first spool valve is equipped with a first fusible plug (not shown in the figure), and the second spool valve is equipped with a second fusible plug (not shown in the figure). The first and second fusible plugs have the same melting point, and the first fusible plug is used to control the first spool valve to be in the conducting state, while the second fusible plug is used to control the second spool valve to be in the conducting state. When the first and second fusible plugs reach their melting points, they will melt, thereby putting the first and second spool valves into the conducting state.

[0047] In practice, if the temperature in the pipeline rises and exceeds the melting point of the first and second fusible plugs, the first and second fusible plugs will melt, causing both the first and second slide valves to be in the conducting state. In this way, the high-pressure hydraulic oil in the accumulator 3 can enter the valve drive 5 through the first slide valve, thereby causing the valve drive 5 to drive the valve to close the pipeline, so as to prevent the fluid from continuing to flow in the pipeline and thus prevent the fluid from continuing to flow towards the burning area, thereby facilitating the rapid reduction and eventual extinguishing of the fire. This greatly improves the safety of pipeline fluid transmission.

[0048] The hydraulic oil flowing from the outlet of valve actuator 5 further flows through the second spool valve to the first shut-off valve, and then from the first shut-off valve into the hydraulic oil tank 1. This makes it difficult to achieve the recycling of hydraulic oil and increase the recycling rate of hydraulic oil. After the pipeline valve is closed, the first shut-off valve is manually controlled to keep it in the closed state, thereby facilitating the valve actuator 5 to stop driving the valve to close the pipeline.

[0049] The left outlet of the hydraulic lock 23 is connected to the oil inlet of the valve drive 5 through a preset pipeline, and the right outlet of the hydraulic lock 23 is connected to the oil outlet of the valve drive 5 through a preset pipeline.

[0050] During implementation, after the pipeline temperature returns to normal, the manual directional valve 22 is manually operated to select the left outlet, and then the manual pump 21 is manually operated to pump the hydraulic oil in the hydraulic oil tank 1 into the valve drive 5, thereby opening the pipeline valve so that the pipeline can transmit fluid normally.

[0051] If it is necessary to manually close the pipeline valve in an emergency, the manual directional valve 22 can be manually operated to select the right outlet, and then the manual pump 21 can be manually operated to pump the hydraulic oil in the hydraulic oil tank 1 into the valve drive 5, thereby closing the pipeline valve.

[0052] In one embodiment, both the first solenoid valve 61 and the second solenoid valve 72 are connected to a supercapacitor (not shown in the figure) and a current detection switch (not shown in the figure). The current detection switch is used to detect whether the external power supply is supplying power to the first solenoid valve 61 and the second solenoid valve 72 normally during the period when power is needed. If not, the supercapacitor is controlled to continue supplying power to the first solenoid valve 61 and the second solenoid valve 72, thereby improving the stability of the normal operation of the first solenoid valve 61 and the second solenoid valve 72, as well as the stability of closing the pipeline valve when the pressure inside the pipeline is not within the pressure threshold range.

[0053] In one embodiment, the second shut-off valve 24 is connected to the fourth shut-off valve through a preset pipeline. In the initial state, the fourth shut-off valve is in the closed state and is connected to the hydraulic oil tank 1 through a preset pipeline.

[0054] In practice, when it is necessary to replace the accumulator 3 which still contains hydraulic oil, the first and fourth shut-off valves can be controlled to be in the open state, so that the hydraulic oil remaining in the accumulator 3 can flow back to the hydraulic oil tank 1.

[0055] This application also discloses a method of using a self-powered double-acting hydraulic actuator, based on the above-mentioned self-powered double-acting hydraulic actuator, with reference to... Figure 2 The usage methods of the self-powered double-acting hydraulic actuator include:

[0056] The energy storage device 3 is pressurized by the pressurizing component 2 until the overflow valve 43 opens automatically.

[0057] When the pressure relay 44 detects that the energy storage device 3 is below the preset first pressure threshold, the alarm 45 is activated.

[0058] When the pressure sensor detects that the pressure in the pipeline is not within the preset pressure threshold range, the controller controls the first on / off component 6 to be in the open state, thereby causing the valve drive component 5 to drive the valve to close.

[0059] When both the first fusible plug in the first slide valve and the second fusible plug in the second slide valve melt, the high-pressure hydraulic oil in the accumulator 3 drives the valve actuator 5 to close the pipeline valve.

[0060] Figure 2 This is a flowchart illustrating the usage of a self-propelled double-acting hydraulic actuator in one embodiment. It should be understood that, although... Figure 2The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows; unless explicitly stated otherwise, there is no strict order requirement for the execution of these steps, and they can be executed in other orders; and Figure 2 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-powered double-acting hydraulic actuator, characterized in that: The system includes a pressurizing assembly (2), on which an energy storage device (3) is connected. The pressurizing assembly (2) includes a manual pump (21), which is connected to a manual directional valve (22). The manual directional valve (22) is connected to a hydraulic lock (23) connected to the energy storage device (3). The energy storage device (3) is connected to an overflow valve (43), and the energy storage device (3) is also connected to a valve actuator (5). The valve actuator (5) is used to drive a valve installed on the pipeline. A pressure relay (44) and a first on / off assembly (6) are connected between the valve actuator (5) and the energy storage device (3). The first on / off assembly (6) is used to control the on / off between the overflow valve (43) and the valve actuator (5). The pressure relay (44) is connected to an alarm (45). A pressure sensor is installed in the pipeline. The pressure sensor is communicatively connected to a controller for controlling the first on / off assembly (6). The valve... A second on / off assembly (7) connected to the controller is connected to the oil outlet of the door drive (5). The second on / off assembly (7) is connected to the hydraulic oil tank (1). The hydraulic lock (23) is connected to a second shut-off valve (24) through a preset pipeline. The second shut-off valve (24) is connected to the accumulator (3) through a preset pipeline. The manual directional valve (22) has a left position outlet, a middle position outlet and a right position outlet. When the middle position outlet is manually selected, the hydraulic lock (23) and the second shut-off valve (24) are opened, and the hydraulic oil in the hydraulic oil tank (1) is pumped into the accumulator (3). When the left position outlet is manually selected, the hydraulic oil in the hydraulic oil tank (1) is pumped into the valve drive (5), thereby opening the pipeline valve. When the right position outlet is manually selected, the hydraulic oil in the hydraulic oil tank (1) is pumped into the valve drive (5), thereby closing the pipeline valve.

2. The self-powered double-acting hydraulic actuator structure according to claim 1, characterized in that: The pressurization assembly (2) is connected to the hydraulic oil tank (1), and the overflow valve (43) is also connected to the hydraulic oil tank (1).

3. The self-powered double-acting hydraulic actuator structure according to claim 2, characterized in that: The first on / off assembly (6) includes a first solenoid valve (61) connected to the energy storage device (3), the first solenoid valve (61) being communicatively connected to the controller, and a first one-way throttle valve being connected between the first solenoid valve (61) and the oil inlet of the valve drive (5).

4. The self-powered double-acting hydraulic actuator structure according to claim 3, characterized in that: The first solenoid valve (61) is connected to an external power supply, and the controller is used to control the on / off connection between the first solenoid valve (61) and the external power supply.

5. The self-powered double-acting hydraulic actuator structure according to claim 2, characterized in that: A first slide valve (8) with a built-in first fusible plug is connected between the energy storage device (3) and the oil inlet of the valve drive (5). The fusible plug is used to control the first slide valve (8) to be in the closed state.

6. The self-powered double-acting hydraulic actuator structure according to claim 5, characterized in that: The valve drive (5) is connected to a second slide valve (91) with a built-in second fusible plug at its oil outlet, and the second slide valve (91) is connected to a first shut-off valve (92).

7. The self-powered double-acting hydraulic actuator structure according to claim 6, characterized in that: The first shut-off valve (92) is connected to the hydraulic oil tank (1).

8. A method of using a self-powered double-acting hydraulic actuator, based on the self-powered double-acting hydraulic actuator of claim 1, characterized in that: include: The energy storage device (3) is pressurized by the pressurizing component (2) until the overflow valve (43) opens automatically; When the pressure relay (44) detects that the energy storage device (3) is lower than the preset first pressure threshold, the alarm (45) is activated; when the pressure sensor detects that the pressure in the pipeline is not within the preset pressure threshold range, the controller controls the first on / off component (6) to be in the open state, thereby causing the valve drive component (5) to drive the valve to close.

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