Static pressure support servo actuator for vibration test

Abstract

The utility model relates to vibration test equipment field discloses a static pressure support servo actuator for vibration test, including cylinder, the top of cylinder is connected with front and rear cylinder cover no.

Description

Technical Field

[0001] This utility model relates to the field of vibration testing equipment, and in particular to a hydrostatic support servo actuator for vibration testing. Background Technology

[0002] Vibration testing is crucial in high-end equipment fields such as aerospace and automotive manufacturing, serving as a core means of verifying the structural strength, reliability, and durability of products. As a key actuator in vibration testing, the performance of the hydrostatic support servo actuator directly determines the accuracy of the test data and the validity of the results, playing an irreplaceable role in ensuring product development quality and market application safety.

[0003] In the existing technology, servo actuators for vibration testing mostly adopt traditional sliding friction or rolling support structures, and realize the reciprocating motion of the piston rod through hydraulic drive or electric control. They are equipped with conventional valve groups to regulate hydraulic flow and pressure, and combined with displacement detection elements to control the motion stroke, so as to simulate vibration environments under different working conditions.

[0004] The existing technology has the following drawbacks: the frictional resistance of the traditional support structure is relatively large, which leads to the high starting pressure of the actuator, making it difficult to achieve accurate response under high frequency vibration. At the same time, it is easy to cause distortion of velocity and acceleration waveforms, which cannot meet the stringent requirements of high-requirement vibration testing for smooth motion and data accuracy. To address these issues, a hydrostatic support servo actuator for vibration testing is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a hydrostatic support servo actuator for vibration testing, which aims to improve the problems of existing actuators having high frictional resistance, high starting pressure, limited test frequency, and easy resonance leading to waveform distortion, thus failing to meet high-requirement testing needs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a hydrostatic support servo actuator for vibration testing, comprising a cylinder, a front and rear cylinder head 1 fixedly connected to the top of the cylinder by screws, a second front and rear cylinder head 2 fixedly connected to the bottom of the cylinder by screws, a multi-functional valve plate fixedly connected to the outer wall of the cylinder by screws, a servo valve fixedly connected to the outer wall of the multi-functional valve plate by screws, a flow valve threadedly connected to the upper part of the multi-functional valve plate, a piston rod provided on the inner wall of the first front and rear cylinder head 1, a tailstock fixedly connected to the bottom of the second front and rear cylinder head 2 by screws, a displacement sensor fixedly connected to the inner wall of the tailstock by screws, and one end of an oil drain pipe fixedly connected to the outer wall of the first front and rear cylinder head 1 by a threaded joint.

[0007] As a further description of the above technical solution: The top of the flow valve is connected to the servo valve via a pipe.

[0008] As a further description of the above technical solution: The piston rod is slidably connected to the inner wall of the cylinder.

[0009] As a further description of the above technical solution: The other end of the drain pipe is fixedly connected to the outer wall of the tailstock via a threaded joint.

[0010] This utility model has the following beneficial effects: 1. In this utility model, a hydrostatic support structure and gap sealing design are adopted. A stable lubricating oil film is formed by external oil supply, which realizes the piston rod suspension support and also has a lubrication function, greatly reducing the frictional resistance of motion. This enables the actuator to have a low starting pressure of ≤0.005MPa and a high test frequency of 200Hz, ensuring smooth motion.

[0011] 2. In this utility model, the cylinder and piston rod are forged from high-strength alloy steel, which can stably output a rated static load of 28T and a rated dynamic load of 20T; with the displacement sensor, the stroke can be accurately controlled; the multi-functional valve plate can avoid the resonance point by adjusting the flow valve, which significantly reduces the distortion of speed and acceleration waveforms and meets the high requirements of vibration test conditions. Attached Figure Description

[0012] Figure 1 A schematic diagram showing the cylinder and multi-functional valve plate of a hydrostatic support servo actuator for vibration testing proposed in this utility model; Figure 2 This is a schematic diagram showing the drain pipe of a hydrostatic support servo actuator for vibration testing proposed in this utility model; Figure 3 This is a schematic diagram illustrating a displacement sensor for a hydrostatic support servo actuator used in vibration testing, as proposed in this utility model. Figure 4 This is a schematic diagram of a servo valve for a static pressure support servo actuator for vibration testing proposed in this utility model.

[0013] Legend: 1. Cylinder; 2. Piston rod; 3. Front and rear cylinder heads (I); 4. Displacement sensor; 5. Multifunctional valve plate; 6. Servo valve; 7. Flow valve; 8. Tailstock; 9. Drain pipe; 10. Front and rear cylinder heads (II). Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Reference Figures 1-3 This utility model provides an embodiment of a hydrostatic support servo actuator for vibration testing, comprising a cylinder 1 forged from high-strength alloy steel, possessing sufficient tensile strength and rigidity. The top of the cylinder 1 is fixedly connected to a front and rear cylinder head 3 by screws, and the bottom of the cylinder 1 is fixedly connected to a second front and rear cylinder head 10 by screws. The second front and rear cylinder heads 10 and the top connection structure form a symmetrical layout, further enhancing the overall structural balance. A multi-functional valve plate 5 is fixedly connected to the outer wall of the cylinder 1 by screws. The multi-functional valve plate 5 has an independent external oil supply port, providing stable oil supply for the hydrostatic support. A servo valve 6 is fixedly connected to the outer wall of the multi-functional valve plate 5 by screws. The tight connection between the two ensures accurate transmission of hydraulic control signals. The upper part of the functional valve plate 5 is threaded with a flow valve 7. The threaded connection facilitates the subsequent disassembly, maintenance and opening size adjustment of the flow valve 7. The inner wall of the front and rear cylinder heads 1 3 is provided with a piston rod 2. The piston rod 2 and the front and rear cylinder heads 1 3 form a gap seal through a clearance fit, which can realize the pressure reduction and return of high pressure oil. The bottom end of the front and rear cylinder heads 2 10 is fixedly connected with a tailstock 8 by screws. The tailstock 8 can play a fixed support role for the entire device. The inner wall of the tailstock 8 is fixedly connected with a displacement sensor 4 by screws. The displacement sensor 4 can capture the position information of the piston rod 2 in real time and feed it back to the controller. The outer wall of the front and rear cylinder heads 1 3 is fixedly connected with one end of the drain pipe 9 by a threaded joint. The drain pipe 9 provides a return channel for the oil in the gap, ensuring smooth circulation of the hydraulic system.

[0016] Reference Figures 2-4 The top of the flow valve 7 is connected to the servo valve 6 through a pipe. The pipe connection enables stable transmission of hydraulic oil and ensures coordinated operation of flow regulation and servo control. The piston rod 2 is slidably connected to the inner wall of the cylinder 1. An oil film will adhere in the gap between the two, which greatly reduces the frictional resistance when the piston rod 2 reciprocates. The other end of the drain pipe 9 is fixedly connected to the outer wall of the tailstock 8 through a threaded joint, so that the drain pipe 9 forms a complete return path, allowing the depressurized oil to flow smoothly back to the oil tank.

[0017] Working principle: When the external oil supply system supplies pressurized oil to the hydrostatic support chamber of the front and rear cylinder heads 3, the oil is transported by the compensation element to form a lubricating oil film with sufficient pressure. At this time, the piston rod 2 is suspended in the center of the inner hole of the front and rear cylinder heads 3. The piston rod 2 and the front and rear cylinder heads 3 form a sealing structure through clearance fit. Then, the high pressure oil is reduced to 0 pressure by the continuous reciprocating movement of the piston rod 2 and then flows back to the oil tank through the drain pipe 9. The oil at the gap during the operation of the device also has a lubricating effect, which greatly reduces the frictional resistance when the piston rod 2 reciprocates. Combined with the high precision clearance fit between the cylinder 1 and the piston rod 2 and the oil film adhesion effect, the smoothness of the movement is ensured, so that the actuator has a low starting pressure of ≤0.005MPa and a high test frequency of 200Hz.

[0018] When the system pressure acts on the effective cross-sectional area of ​​the piston rod 2, combined with the excellent tensile strength and stiffness brought by the high-strength alloy steel forging material of cylinder 1 and piston rod 2, a stable output of 28T rated static load and 20T rated dynamic load can be achieved. At this time, the displacement sensor 4 can capture the position information of the piston rod 2 in real time and feed it back to the controller to accurately control the motion stroke. The multi-functional valve plate 5 provides stable oil supply to the hydrostatic support through an independent external oil supply port. When the actuator resonates and the waveform distortion increases, the resonance point can be avoided by adjusting the opening size of the flow valve 7 on it. Ultimately, the actuator has low speed waveform distortion and low acceleration waveform distortion in vibration testing to meet the high-requirement test conditions.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydrostatic support servo actuator for vibration testing, comprising a cylinder (1), characterized in that: The top of the cylinder (1) is fixedly connected to the front and rear cylinder heads (3) by screws. The bottom of the cylinder (1) is fixedly connected to the front and rear cylinder heads (10) by screws. The outer wall of the cylinder (1) is fixedly connected to the multi-functional valve plate (5) by screws. The outer wall of the multi-functional valve plate (5) is fixedly connected to the servo valve (6) by screws. The upper part of the multi-functional valve plate (5) is threadedly connected to the flow valve (7). The inner wall of the front and rear cylinder heads (3) is provided with a piston rod (2). The bottom of the front and rear cylinder heads (10) is fixedly connected to the tailstock (8) by screws. The inner wall of the tailstock (8) is fixedly connected to the displacement sensor (4) by screws. The outer wall of the front and rear cylinder heads (3) is fixedly connected to one end of the drain pipe (9) by a threaded joint.

2. The hydrostatic support servo actuator for vibration testing according to claim 1, characterized in that: The top of the flow valve (7) is connected to the servo valve (6) via a pipe.

3. The hydrostatic support servo actuator for vibration testing according to claim 1, characterized in that: The piston rod (2) is slidably connected to the inner wall of the cylinder (1).

4. A hydrostatic support servo actuator for vibration testing according to claim 1, characterized in that: The other end of the drain pipe (9) is fixedly connected to the outer wall of the tailstock (8) via a threaded joint.

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