Hydraulic control unit for servo actuator

Abstract

The invention provides a hydraulic control unit for a servo actuator, which belongs to the technical field of aircraft tests and specifically comprises a hydraulic servo valve, an electromagnetic directional valve, a first hydraulic control logic valve, a second hydraulic control logic valve, a third hydraulic control logic valve and a fourth hydraulic control logic valve. The hydraulic servo valve is connected to the servo actuator through the first hydraulic control logic valve and the second hydraulic control logic valve, the electromagnetic directional valve controls the four hydraulic control logic valves at the same time, the first hydraulic control logic valve and the second hydraulic control logic valve are in a normally-closed type, the third hydraulic control logic valve and the fourth hydraulic control logic valve are in a normally-open type, the electromagnetic directional valve is powered off, and the hydraulic servo valve is powered off. The first hydraulic control logic valve and the second hydraulic control logic valve are in a closed state, and the third hydraulic control logic valve and the fourth hydraulic control logic valve are in an open state, so that no matter the control system or the hydraulic servo valve has any fault, the out-of-control action of the servo actuator cannot be caused, and the safety of test equipment or a test piece cannot be harmed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aircraft testing, and in particular to a hydraulic control unit for a servo actuator. BACKGROUND

[0002] In the field of large aircraft testing technology, loading tests achieved by servo actuators are an indispensable part to ensure the safety and reliability of the aircraft. Such actuators, with their large output force, fast response speed and high control precision, can simulate real flight load conditions in a ground test environment, comprehensively evaluating and verifying the aircraft structure, control system and key components. It can simulate various complex mechanical environments encountered during flight, including impact forces during takeoff and landing, dynamic stresses caused by airflow, and fatigue loads during long-term flight. By accurately replicating these load conditions, researchers can comprehensively test the strength, durability of the aircraft structure and the accuracy of the flight control system in a ground laboratory, effectively reducing the risk and cost of flight testing.

[0003] As the core loading component in this test system, the reliability of the hydraulic control principle of the servo actuator directly determines the safety of the test. In general hydraulic principles, the servo valve directly controls the servo actuator, and the measurement and control computer drives the servo valve through the controller to achieve displacement control or load control of the servo actuator. In the event of an emergency during the test, the measurement and control computer can immediately issue a safety signal to control the servo valve to achieve the required safety action. However, this operation has two hidden dangers. First, the control computer may lose control or send incorrect instructions due to some reason. Second, the servo valve fails, causing the valve core to jam or be uncontrollable. Both of the above phenomena will cause the displacement or load of the actuator to be out of control, seriously affecting the safety of the test equipment and test pieces. SUMMARY

[0004] Therefore, the present application provides a hydraulic control unit for a servo actuator to solve the safety problem of test equipment or test pieces caused by control system failure or servo valve failure during the test process. By cutting off the hydraulic servo valve and the servo actuator, a more reliable actuator unloading or load holding function is achieved.

[0005] The hydraulic control unit for a servo actuator provided by the present application adopts the following technical solution: A hydraulic control unit for a servo actuator, comprising a hydraulic servo valve, an electromagnetic reversing valve, a first hydraulic control logic valve, a second hydraulic control logic valve, a third hydraulic control logic valve and a fourth hydraulic control logic valve. The hydraulic control port of the hydraulic servo valve is connected with a hydraulic pump, the return port of the hydraulic servo valve is connected with a liquid storage tank, the working port A of the hydraulic servo valve is connected with the working port A of a first hydraulic control logic valve, the working port B of the hydraulic servo valve is connected with the working port A of a second hydraulic control logic valve, the working port B of the first hydraulic control logic valve is connected with the rodless cavity of a servo actuator, and the working port B of the second hydraulic control logic valve is connected with the rod cavity of the servo actuator. The hydraulic control port of the electromagnetic reversing valve is connected with a hydraulic pump, the return port of the electromagnetic reversing valve is connected with a liquid storage tank, the working port A of the electromagnetic reversing valve is connected with the hydraulic control ports of a third hydraulic control logic valve, a fourth hydraulic control logic valve, a first hydraulic control logic valve and a second hydraulic control logic valve, the working port A of the third hydraulic control logic valve is connected with the rodless cavity of a servo actuator, the working port A of the fourth hydraulic control logic valve is connected with the rod cavity of the servo actuator, and the working port B of the third hydraulic control logic valve and the working port B of the fourth hydraulic control logic valve are both connected with the liquid storage tank. The first hydraulic control logic valve and the second hydraulic control logic valve are normally closed, the third hydraulic control logic valve and the fourth hydraulic control logic valve are normally open, the electromagnetic reversing valve is powered on to start, the working port A of the electromagnetic reversing valve outputs liquid with a preset pressure to drive the first hydraulic control logic valve and the second hydraulic control logic valve to open and drive the third hydraulic control logic valve and the fourth hydraulic control logic valve to close, and the servo actuator is controlled by the hydraulic servo valve to act.

[0006] Optionally, the outlet of the hydraulic pump is connected with a filter.

[0007] Optionally, the filtering precision of the filter is 3-5 microns.

[0008] Optionally, the filter maintains normal filtering precision under a liquid pressure of 21 MPa or less.

[0009] Optionally, the hydraulic servo valve, the electromagnetic reversing valve, the first hydraulic control logic valve, the second hydraulic control logic valve, the third hydraulic control logic valve and the fourth hydraulic control logic valve are installed on a valve block, the valve block is provided with a liquid supply port and a return port, all the liquid supply ports are connected with a hydraulic pump, and the return port is connected with a liquid storage tank. The hydraulic servo valve is connected with the first hydraulic control logic valve and the second hydraulic control logic valve through internal channels of the valve block. The electromagnetic reversing valve is connected with the first hydraulic control logic valve, the second hydraulic control logic valve, the third hydraulic control logic valve and the fourth hydraulic control logic valve through internal channels of the valve block. The hydraulic control port of the hydraulic servo valve and the hydraulic control port of the electromagnetic reversing valve are connected with the liquid supply port. The return port of the hydraulic servo valve and the return port of the electromagnetic reversing valve are connected with the return port.

[0010] Optionally, the pressure relief ports of the first, second, third and fourth hydraulic control logic valves are communicated with the liquid return port.

[0011] Optionally, a first one-way throttle valve is arranged between the third hydraulic control logic valve and the liquid storage tank, and is used to regulate the flow rate of the working B port of the third hydraulic control logic valve to the liquid storage tank. A second one-way throttle valve is arranged between the fourth hydraulic control logic valve and the liquid storage tank, and is used to regulate the flow rate of the working B port of the fourth hydraulic control logic valve to the liquid storage tank.

[0012] In summary, the present application has the following beneficial technical effects: The present application adopts an independent control circuit, can reliably disconnect the flow path of the hydraulic servo valve and the servo actuator, and ensures that the control system or the hydraulic servo valve will not cause the servo actuator to lose control and act, thereby endangering the safety of the test equipment or test piece, no matter what fault occurs.

[0013] Based on different test requirements, the present application covers two types of basic hydraulic control units and load-holding hydraulic control units, and can select the corresponding functional hydraulic control unit according to different test requirements, thereby having high test matching performance. The two types of units differ in that the basic type does not have a first one-way throttle valve and a second one-way throttle valve, and the basic hydraulic control unit can be adapted to test working conditions that do not require emergency load holding.

[0014] The hydraulic valve group unit is designed by using a cartridge valve, which greatly reduces the design size of the unit, and the valve block is processed by using 6061 aviation aluminum, which greatly reduces the overall size and weight of the hydraulic control unit, and facilitates assembly and use. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0016] Figure 1 The principle block diagram of the basic hydraulic control unit for the servo actuator according to the present application is shown in FIG. 1. Figure 2 The structural schematic diagram of the basic hydraulic control unit for the servo actuator according to the present application is shown in FIG. 2. Figure 3 The structural schematic diagram of the basic hydraulic control unit for the servo actuator according to the present application is shown in FIG. 2. Figure 4 The principle block diagram of the load-holding hydraulic control unit for the servo actuator according to the present application is shown in FIG. 3. Figure 5 Fig. 1 is a structural schematic diagram of a hydraulic control unit for a servo actuator according to an embodiment of the present application; Figure 6 Fig. 2 is a structural schematic diagram of the hydraulic control unit for the servo actuator according to the embodiment of the present application from another perspective; Figure 7 Fig. 3 is a structural schematic diagram of the hydraulic control unit for the servo actuator according to the embodiment of the present application and the servo actuator connected thereto.

[0017] Reference signs: 1, hydraulic servo valve; 2, electromagnetic directional control valve; 3, first hydraulic control logic valve; 4, second hydraulic control logic valve; 5, third hydraulic control logic valve; 6, fourth hydraulic control logic valve; 7, filter; 8, first one-way throttle valve; 9, second one-way throttle valve; 10, servo actuator. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described in detail below with reference to the drawings.

[0019] The above embodiments of the present application are described with reference to the accompanying drawings, and other advantages and effects of the present application will be more clearly understood from the above description. It should be understood that the above description is merely illustrative of the embodiments of the present application, but is not intended to be all-encompassing. The present application can be implemented or applied in other different embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0020] It should be noted that the various aspects described below are within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms and that any specific structure and / or function described herein is merely illustrative. Based on the teachings herein one skilled in the art should appreciate that an aspect described herein can be implemented independently of any other aspects and that an aspect described herein can be implemented both as any claim and over multiple claims. For example, an apparatus can be implemented using any number of the aspects described herein. In addition, an apparatus can be implemented or a method can be practiced using other structure and / or functionality not expressly described herein, for example in connection with a claim.

[0021] It is also need to be explained that the figures provided in the following embodiments only schematically illustrate the basic ideas of the present application, and only show the components related to the present application in the figures, not drawn according to the number, shape and size of the components in actual implementation, and the shape, number and proportion of each component in actual implementation can be a random change, and the component layout pattern can be more complex.

[0022] In addition, in the following description, specific details are provided in order to facilitate a thorough understanding of the examples. However, one skilled in the art will understand that the aspects described can be practiced without these specific details.

[0023] The embodiment of the present application provides a hydraulic control unit for a servo actuator.

[0024] As shown in Figure 1 , Figure 2 and Figure 3 A hydraulic control unit for a servo actuator comprises a hydraulic servo valve 1, an electromagnetic reversing valve 2, a first hydraulic control logic valve 3, a second hydraulic control logic valve 4, a third hydraulic control logic valve 5 and a fourth hydraulic control logic valve 6.

[0025] The hydraulic control port of the hydraulic servo valve 1 is connected with a hydraulic pump, the return port of the hydraulic servo valve 1 is connected with a liquid storage tank, the working A port of the hydraulic servo valve 1 is connected with the working A port of the first hydraulic control logic valve 3, the working B port of the hydraulic servo valve 1 is connected with the working A port of the second hydraulic control logic valve 4, the working B port of the first hydraulic control logic valve 3 is connected with the rodless cavity of a servo actuator 10, and the working B port of the second hydraulic control logic valve 4 is connected with the rod cavity of the servo actuator 10. The servo actuator 10 is a hydraulic servo actuator.

[0026] The hydraulic control port of the electromagnetic reversing valve 2 is connected with a hydraulic pump, the return port of the electromagnetic reversing valve 2 is connected with a liquid storage tank, the working A port of the electromagnetic reversing valve 2 is connected with the hydraulic control port of the third hydraulic control logic valve 5, the hydraulic control port of the fourth hydraulic control logic valve 6, the hydraulic control port of the first hydraulic control logic valve 3 and the hydraulic control port of the second hydraulic control logic valve 4, the working A port of the third hydraulic control logic valve 5 is connected with the rodless cavity of the servo actuator 10, the working A port of the fourth hydraulic control logic valve 6 is connected with the rod cavity of the servo actuator 10, and the working B port of the third hydraulic control logic valve 5 and the working B port of the fourth hydraulic control logic valve 6 are both connected with the liquid storage tank.

[0027] The first hydraulic control logic valve 3 and the second hydraulic control logic valve 4 are normally closed, and the third hydraulic control logic valve 5 and the fourth hydraulic control logic valve 6 are normally open.

[0028] The present application controls four hydraulic control logic valves through one electromagnetic reversing valve 2.

[0029] When the servo actuator 10 needs to be actuated, the control computer outputs a switching signal to the electromagnetic reversing valve 2, the electromagnetic reversing valve 2 is energized to start, the working A port of the electromagnetic reversing valve 2 outputs liquid with a preset pressure, drives the first and second hydraulic control logic valves 3 and 4 to open, and drives the third and fourth hydraulic control logic valves 5 and 6 to close, the servo actuator 10 is actuated under the control of the hydraulic servo valve 1, and the first and second hydraulic control logic valves supply liquid to the servo actuator 10. The control computer outputs an instruction signal, which is compared with a displacement or load signal feedback of the servo actuator 10, and then is calculated by a PID control module to be converted into an analog signal, which is output to the hydraulic servo valve 1, the hydraulic servo valve 1 drives the servo actuator 10 to complete displacement closed-loop control or load closed-loop control test requirements.

[0030] When the servo actuator 10 needs to be actuated, the control computer outputs a switching signal to the electromagnetic reversing valve 2, the electromagnetic reversing valve 2 is energized to start, the working A port of the electromagnetic reversing valve 2 outputs liquid with a preset pressure, drives the first and second hydraulic control logic valves 3 and 4 to open, and drives the third and fourth hydraulic control logic valves 5 and 6 to close, the servo actuator 10 is actuated under the control of the hydraulic servo valve 1, and the first and second hydraulic control logic valves supply liquid to the servo actuator 10. The control computer outputs an instruction signal, which is compared with a displacement or load signal feedback of the servo actuator 10, and then is calculated by a PID control module to be converted into an analog signal, which is output to the hydraulic servo valve 1, the hydraulic servo valve 1 drives the servo actuator 10 to complete displacement closed-loop control or load closed-loop control test requirements.

[0031] In the embodiment, the hydraulic pump provides hydraulic working liquid medium with a preset pressure for the hydraulic servo valve and the electromagnetic reversing valve.

[0032] As shown in Figures 4 to 7 The third hydraulic control logic valve 5 and the liquid tank are provided with a first one-way throttle valve 8, the first one-way throttle valve 8 is used for adjusting the flow of the working B port of the third hydraulic control logic valve 5 to the liquid tank; and the fourth hydraulic control logic valve 6 and the liquid tank are provided with a second one-way throttle valve 9, the second one-way throttle valve 9 is used for adjusting the flow of the working B port of the fourth hydraulic control logic valve 6 to the liquid tank.

[0033] When the first one-way throttle valve 8 and the second one-way throttle valve 9 are closed, the liquid in the servo actuator 10 cannot flow back when the electromagnetic reversing valve 2 is powered off, so that the servo actuator 10 is in a load-holding state. By adjusting the opening size of the first one-way throttle valve 8 and the second one-way throttle valve 9, the control of the liquid unloading speed of the two cavities of the servo actuator 10 can be realized, and the requirement of different pressure unloading speeds of the two cavities of the servo actuator 10 can be met for some special tests. The hydraulic control unit with the first one-way throttle valve 8 and the second one-way throttle valve 9 is a load-holding type hydraulic control unit; the hydraulic control unit without the first one-way throttle valve 8 and the second one-way throttle valve 9 is a basic type hydraulic control unit.

[0034] The outlet of the hydraulic pump is connected with a filter 7; the filtering precision of the filter 7 is 3-5 microns; the filter 7 maintains normal filtering precision under the liquid pressure within 21 MPa.

[0035] The hydraulic servo valve 1, the electromagnetic reversing valve 2, the first hydraulic control logic valve 3, the second hydraulic control logic valve 4, the third hydraulic control logic valve 5 and the fourth hydraulic control logic valve 6 are installed on a valve block, the valve block is provided with a liquid supply port and a liquid return port, all the liquid supply ports are connected with the hydraulic pump, and the liquid return port is connected with a liquid storage tank.

[0036] As shown in Figure 2 and Figure 5 , the hydraulic servo valve 1 is connected with the first hydraulic control logic valve 3 and the second hydraulic control logic valve 4 through the internal channels of the valve block; the electromagnetic reversing valve 2 is connected with the first hydraulic control logic valve 3, the second hydraulic control logic valve 4, the third hydraulic control logic valve 5 and the fourth hydraulic control logic valve 6 through the internal channels of the valve block; the liquid control port of the hydraulic servo valve 1 and the liquid control port of the electromagnetic reversing valve 2 communicate with the liquid supply port; the liquid return port of the hydraulic servo valve 1 and the liquid return port of the electromagnetic reversing valve 2 communicate with the liquid return port; the pressure relief ports of the first hydraulic control logic valve 3, the second hydraulic control logic valve 4, the third hydraulic control logic valve 5 and the fourth hydraulic control logic valve 6 communicate with the liquid return port. The plug-in valve is used to design the hydraulic valve group unit, which greatly reduces the design size of the unit; and the valve block is processed by 6061 aviation aluminum, which greatly reduces the size and weight of the whole hydraulic control unit, facilitates assembly and use.

[0037] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed in the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hydraulic control unit for a servo actuator, characterized in that, It includes a hydraulic servo valve (1), a solenoid directional valve (2), a first hydraulic control logic valve (3), a second hydraulic control logic valve (4), a third hydraulic control logic valve (5), and a fourth hydraulic control logic valve (6); The hydraulic servo valve (1) has its hydraulic control port connected to a hydraulic pump, its return port connected to a reservoir, its working port A connected to the working port A of the first hydraulic control logic valve (3), its working port B connected to the working port A of the second hydraulic control logic valve (4), its working port B connected to the rodless chamber of the servo actuator (10), and its working port B connected to the rod chamber of the servo actuator (10). The hydraulic control port of the electromagnetic directional valve (2) is connected to the hydraulic pump, and the return port of the electromagnetic directional valve (2) is connected to the storage tank. The working port A of the electromagnetic directional valve (2) is connected to the hydraulic control port of the third hydraulic control logic valve (5), the hydraulic control port of the fourth hydraulic control logic valve (6), the hydraulic control port of the first hydraulic control logic valve (3), and the hydraulic control port of the second hydraulic control logic valve (4). The working port A of the third hydraulic control logic valve (5) is connected to the rodless chamber of the servo actuator (10), and the working port A of the fourth hydraulic control logic valve (6) is connected to the rod chamber of the servo actuator (10). The working ports B of the third hydraulic control logic valve (5) and the fourth hydraulic control logic valve (6) are both connected to the storage tank. The first hydraulic control logic valve (3) and the second hydraulic control logic valve (4) are normally closed, and the third hydraulic control logic valve (5) and the fourth hydraulic control logic valve (6) are normally open. When the solenoid directional valve (2) is energized, the working port A of the solenoid directional valve (2) outputs liquid with a preset pressure, which drives the first hydraulic control logic valve (3) and the second hydraulic control logic valve (4) to open and drives the third hydraulic control logic valve (5) and the fourth hydraulic control logic valve (6) to close. The servo actuator (10) operates under the control of the hydraulic servo valve (1).

2. The hydraulic control unit for a servo actuator according to claim 1, characterized in that, The outlet of the hydraulic pump is connected to a filter (7).

3. The hydraulic control unit for a servo actuator according to claim 2, characterized in that, The filter (7) has a filtration accuracy of 3 to 5 micrometers.

4. The hydraulic control unit for a servo actuator according to claim 2, characterized in that, The filter (7) maintains normal filtration accuracy under liquid pressure up to 21 MPa.

5. The hydraulic control unit for a servo actuator according to claim 1, characterized in that, The hydraulic servo valve (1), solenoid directional valve (2), first hydraulic control logic valve (3), second hydraulic control logic valve (4), third hydraulic control logic valve (5) and fourth hydraulic control logic valve (6) are mounted on a valve block. The valve block is provided with a supply port and a return port. All supply ports are connected to a hydraulic pump, and the return port is connected to a storage tank. The hydraulic servo valve (1) is connected to the first hydraulic control logic valve (3) and the second hydraulic control logic valve (4) through the internal channel of the valve block; The electromagnetic reversing valve (2) is connected to the first hydraulic control logic valve (3), the second hydraulic control logic valve (4), the third hydraulic control logic valve (5) and the fourth hydraulic control logic valve (6) through the internal channel of the valve block; The hydraulic control port of the hydraulic servo valve (1) and the hydraulic control port of the solenoid directional valve (2) are connected to the liquid supply port; The return port of the hydraulic servo valve (1) and the return port of the solenoid directional valve (2) are connected to the return port.

6. The hydraulic control unit for a servo actuator according to claim 1, characterized in that, The pressure relief ports of the first hydraulic control logic valve (3), the second hydraulic control logic valve (4), the third hydraulic control logic valve (5), and the fourth hydraulic control logic valve (6) are connected to the return port.

7. The hydraulic control unit for a servo actuator according to claim 1, characterized in that, A first one-way throttle valve (8) is provided between the third hydraulic control logic valve (5) and the storage tank. The first one-way throttle valve (8) is used to regulate the flow rate from the working port B of the third hydraulic control logic valve (5) to the storage tank. A second one-way throttle valve (9) is provided between the fourth hydraulic control logic valve (6) and the storage tank. The second one-way throttle valve (9) is used to regulate the flow rate from the working port B of the fourth hydraulic control logic valve (6) to the storage tank.

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