High-frequency high-rigidity static pressure supporting servo actuator

Abstract

The utility model relates to the field of static pressure supporting, and discloses a high-frequency high-rigidity static pressure supporting servo actuator which comprises a cylinder barrel, a front cylinder cover and a rear cylinder cover are installed at the left end and the right end of the cylinder barrel through screws, four servo valve plates are installed at the upper end and the lower end of the cylinder barrel through bolts, and a piston at the left end of the cylinder barrel is connected with a piston rod. A sensor mounting barrel is mounted at the right end of the front cylinder cover and the right end of the rear cylinder cover, a displacement sensor is mounted at the right end of the sensor mounting barrel through a bolt, the piston rod is in clearance seal with the cylinder barrel through clearance fit, and the piston rod is in clearance seal with the front cylinder cover and the rear cylinder cover through clearance fit. According to the utility model, the four groups of servo valves are connected in parallel, so that the flow requirement of a high-frequency test can be met, the cylinder barrel adopts a rotary body structure, and the piston rod is formed by forging large-size high-strength alloy steel, so that the rigidity is higher. The device is suitable for a high-frequency and high-rigidity dynamic fatigue test system.

Description

Technical Field

[0001] The utility model relates to the field of hydrostatic supports, in particular to a high-frequency and high-stiffness hydrostatic support servo actuator. Background Art

[0002] A servo actuator is an actuating element in an automatic control system. It can convert an electrical signal into mechanical motion to achieve precise control of a controlled object. When working, the servo actuator receives a command signal from the control system, drives the motor to move according to the requirements of the command signal, and drives the controlled object to move through a mechanical transmission mechanism.

[0003] Currently, conventional servo actuators on the market use sealing rings for sealing. During the movement of the piston rod of the actuator, the friction force is relatively large. Affected by the friction force and structure, the frequency generally does not exceed 100 Hz. At the same time, the diameter of the piston rod is relatively small, and the stiffness of the piston rod is relatively low when subjected to dynamic tensile pressure, which cannot meet the requirements of high-frequency and high-stiffness dynamic fatigue tests. Therefore, a high-frequency and high-stiffness hydrostatic support servo actuator is proposed to solve the above problems. Summary of the Utility Model

[0004] To make up for the above deficiencies, the utility model provides a high-frequency and high-stiffness hydrostatic support servo actuator, aiming to improve the problem that "conventional servo actuators on the market use sealing rings for sealing and cannot meet the requirements of high-frequency and high-stiffness dynamic fatigue tests" in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A high-frequency and high-stiffness hydrostatic support servo actuator includes a cylinder barrel. Both the left and right ends of the cylinder barrel are installed with front and rear cylinder covers through screws. Both the upper and lower ends of the cylinder barrel are installed with four servo valve plates through bolts. The piston at the left end of the cylinder barrel is connected to a piston rod. A sensor installation cylinder is installed at the right end of the front and rear cylinder covers. A displacement sensor is installed at the right end of the sensor installation cylinder through bolts.

[0006] As a further description of the above technical scheme:

[0007] The piston rod is in clearance seal with the cylinder barrel through clearance fit.

[0008] As a further description of the above technical scheme:

[0009] The piston rod is in clearance seal with the front and rear cylinder covers through clearance fit.

[0010] As a further description of the above technical scheme:

[0011] The cylinder diameter D and rod diameter d of the piston rod are Φ390 mm and Φ300 mm respectively.

[0012] As a further description of the above technical solution:

[0013] The front and rear cylinder heads adopt a hydrostatic support structure, and pressure oil is supplied to the hydrostatic support through an external oil supply system.

[0014] As a further description of the above technical solution:

[0015] The piston rod is forged and processed from large-size high-strength alloy steel.

[0016] As a further description of the above technical solution:

[0017] The four servo valve plates are composed of two valve plates, and each valve plate is connected to the cylinder block by screws, so as to realize the parallel connection of four groups of servo valves.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the utility model, by adopting the parallel connection form of 4 groups of servo valves, the flow demand of high-frequency tests can be met. The cylinder barrel adopts a rotary body structure, and the piston rod is forged and processed from large-size high-strength alloy steel, with higher stiffness. It is applicable to the dynamic fatigue test system with high frequency and high stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the overall device in the utility model;

[0021] Figure 2 is a front view schematic diagram of the overall device in the utility model;

[0022] Figure 3 is a top view schematic diagram of the overall device in the utility model;

[0023] Figure 4 is a side view schematic diagram of the overall device in the utility model.

[0024] LEGEND DESCRIPTION:

[0025] 1. Cylinder barrel; 2. Piston rod; 3. Front and rear cylinder heads; 4. Displacement sensor; 5. Four servo valve plates; 6. Sensor installation cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the utility model without making creative efforts shall fall within the protection scope of the utility model.

[0027] Refer toFigure 1 - Figure 3 The utility model provides a high-frequency and high-rigidity static pressure support servo actuator, which includes a cylinder 1, a piston rod 2, a front and rear cylinder cover 3, a displacement sensor 4, a four-servo valve plate 5, a sensor mounting tube 6, etc. The various components of the servo actuator are connected by screws. The cylinder diameter D and the rod diameter d of the piston rod 2 of the actuator are Φ390mm and Φ300mm respectively. It can be seen that the cross-sectional area S=π(D2-d 2 ) / 4=48748.5mm 2. The system pressure supplied to the actuator is 28Mpa. From the formula F=SP=1364.958kN, it can be seen that the rated output static load of the actuator can reach 135T. The dynamic load is calculated according to 80% of the static load. It can be seen that the rated output dynamic load can reach 100T. The front and rear cylinder heads 3 adopt a hydrostatic support structure. The pressure oil is supplied to the hydrostatic support through an external oil supply system, and is transported to the oil chamber of the hydrostatic support through a compensation element to form a lubricating oil film with sufficient pressure and suspend the piston rod 2 in the center of the inner hole of the front and rear cylinder heads 3. At the same time, a gap seal is used between the front and rear cylinder heads 3 and the piston rod 2 instead of the traditional sealing ring seal, eliminating the friction caused by the sealing ring. The starting pressure is ≤0.002MPa. At the same time, 4 groups of servo valves are connected in parallel to meet the flow requirements of high-frequency tests. The test frequency can reach 400Hz. The piston rod 2 is made of large-size high-strength alloy steel forging. The diameter of the piston rod 2 is Φ300mm, which has higher rigidity and is suitable for high-frequency and high-rigidity dynamic fatigue test systems.

[0028] Reference Figure 1 - Figure 3 The cylinder barrel 1 adopts a rotating body structure and is connected to the front and rear cylinder heads 3 and the four servo valve plates 5 by screws. The cylinder barrel 1 is forged with high-strength alloy steel and has a tensile strength of more than 1080Mpa. The dimensional tolerance and form and position tolerance of the cylinder barrel 1 are extremely high, thereby satisfying the smoothness of the piston rod 2 during reciprocating motion in the cylinder barrel 1, thereby obtaining a higher test frequency. The piston rod 2 is gap-sealed with the cylinder barrel 1 and the front and rear cylinder heads 3 through clearance fit. It is the main component for transmitting force in the high-frequency and high-rigidity static pressure support servo actuator, and is subjected to various forces such as tension, pressure, vibration and impact during the test. The piston rod 2 is forged with large-size high-strength alloy steel and has higher rigidity, thereby ensuring the stability of the test structure under dynamic loads.

[0029] Reference Figure 2 - Figure 4The front and rear cylinder heads 3 are connected to the cylinder barrel 1 and the sensor mounting barrel 6 by screws, and the gap is sealed with the piston rod 2 by gap fit. The gap seal between the front and rear cylinder heads 3 and the piston rod 2 replaces the traditional sealing ring seal. This nearly frictionless structure ensures the high-frequency characteristics of the static pressure support actuator in the dynamic load fatigue test. The displacement sensor 4 is connected to the sensor mounting barrel 6 by screws to realize the position control of the piston rod 2, and at the same time, the position information of the detected piston rod 2 is fed back to the controller, so that the specific position of the piston rod 2 can be read intuitively. The four-servo valve plate 5 is composed of two valve plates, each of which is connected to the cylinder body by screws, so as to realize four groups of servo valves in parallel, providing flow requirements for the static pressure support servo actuator during the high-frequency dynamic load fatigue test. The sensor mounting barrel 6 is connected to the front and rear cylinder heads 3 and the displacement sensor 4 by screws, and is used to fix the displacement sensor 4 so that the displacement sensor 4 and the piston rod 2 move relative to each other, thereby reading the position information of the piston rod 2.

[0030] Working principle: The external oil supply system supplies pressure oil to the hydrostatic support of the front and rear cylinder heads 3. The pressure oil is transported to the oil chamber of the hydrostatic support through the compensation element to form a lubricating oil film with sufficient pressure to suspend the piston rod 2 at the center of the inner hole of the front and rear cylinder heads 3. The front and rear cylinder heads 3 and the piston rod 2 are sealed with clearance instead of traditional sealing rings, eliminating the friction caused by the sealing rings. The starting pressure is ≤0.002MPa. Four groups of servo valves are connected in parallel to meet the flow requirements of high-frequency tests. When the control system sends a command signal, the servo valve adjusts the flow and direction of the pressure oil according to the command signal, thereby driving the piston rod 2 to move. The piston rod 2 is fitted with the cylinder barrel 1 and the front and rear cylinder heads 3 through clearance. The clearance seal is formed in the row, and it withstands various forces such as tension, pressure, vibration and impact during the test, and transmits the force to the controlled object. The displacement sensor 4 is used to realize the position control of the piston rod 2, and at the same time, the detected position information of the piston rod 2 is fed back to the controller, so that the specific position of the piston rod 2 can be read intuitively. The four-servo valve plate 5 is composed of two valve plates, each valve plate is connected to the cylinder body by screws, and four groups of servo valves are connected in parallel to provide flow requirements for the static pressure support servo actuator during high-frequency dynamic load fatigue test. The sensor mounting tube 6 is used to fix the displacement sensor 4, so that the displacement sensor 4 and the piston rod 2 move relative to each other, so as to read the position information of the piston rod 2.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are 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 recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-frequency, high-rigidity, hydrostatic support servo actuator, comprising a cylinder (1), characterized in that: The left and right ends of the cylinder barrel (1) are both mounted with front and rear cylinder covers (3) by means of screws, the upper and lower ends of the cylinder barrel (1) are both mounted with four servo valve plates (5) by means of bolts, the left end piston of the cylinder barrel (1) is connected with a piston rod (2), the right ends of the front and rear cylinder covers (3) are mounted with a sensor mounting cylinder (6), and the right end of the sensor mounting cylinder (6) is mounted with a displacement sensor (4) by means of bolts.

2. A high frequency and high stiffness static pressure support servo actuator according to claim 1, characterized in that: The piston rod (2) is gap-sealed with the cylinder barrel (1) through clearance fit.

3. The high-frequency, high-rigidity, static pressure support servo actuator according to claim 1, characterized in that: The piston rod (2) is gap-sealed with the front and rear cylinder covers (3) through clearance fit.

4. The high-frequency, high-rigidity, static pressure support servo actuator according to claim 1, characterized in that: The cylinder diameter D and rod diameter d of the piston rod (2) are Φ390 mm and Φ300 mm respectively.

5. The high-frequency, high-rigidity, static pressure support servo actuator according to claim 1, characterized in that: The front and rear cylinder heads (3) adopt a static pressure support structure, and pressure oil is supplied to the static pressure support through an external oil supply system.

6. The high-frequency, high-rigidity, static pressure support servo actuator according to claim 1, characterized in that: The piston rod (2) is made of large-size high-strength alloy steel by forging.

7. The high-frequency, high-rigidity, static pressure support servo actuator according to claim 1, characterized in that: The four servo valve plates (5) are composed of two valve plates, and each valve plate is connected to the cylinder body via screws, thereby realizing four groups of servo valves connected in parallel.

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