High-speed large-load static pressure support servo actuator

Abstract

The utility model relates to the technical field of static pressure support, and discloses a high-speed large-load static pressure support servo actuator which comprises a cylinder body, the right side of the cylinder body is fixedly connected with a static pressure bearing through a screw, and the top of the cylinder body is fixedly connected with a large-flow servo valve plate through a screw. The right sides of the hydrostatic bearings are fixedly connected with sleeves through screws, the right sides of the sleeves are fixedly connected with displacement sensors through screws, piston rods are in clearance fit with the inner walls of the right sides of the hydrostatic bearings, and the two hydrostatic bearings are symmetrically distributed along the longitudinal center line of the cylinder body. The number of the large-flow servo valve plates is two, and the two large-flow servo valve plates are symmetrically distributed along the transverse center line of the cylinder body. According to the utility model, the rated output load can reach 65T, the test frequency can reach 300Hz, the speed can reach 4m / s, the design flow can reach 6000L / min, the starting pressure is less than or equal to 0.001 MPa, and the high-speed large-load arresting impact test device is suitable for a high-speed large-load arresting impact test system.

Description

Technical Field

[0001] The utility model relates to the technical field of static pressure support, in particular to a high-speed and large-load static pressure support servo actuator. Background Art

[0002] The hydrostatic support servo actuator is a device that uses the hydrostatic principle to support and control mechanical motion. It is usually used in mechanical systems that require high-precision and high-speed control, such as machine tools, printing equipment, semiconductor manufacturing equipment, etc.

[0003] At present, the friction coefficient of large-load servo actuators on the market is relatively large. Affected by the friction coefficient and structure, the actual output force loss is relatively large, and the frequency generally does not exceed 100Hz, and the speed generally does not exceed 2m / s, which is difficult to meet the needs of high-speed impact tests. Therefore, a high-speed, large-load static pressure support servo actuator is proposed to solve the above problems. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a high-speed and large-load static pressure support servo actuator, which aims to improve the problem that the large-load servo actuator in the prior art is difficult to meet the needs of high-speed impact tests.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-speed, large-load hydrostatic support servo actuator, comprising a cylinder body, the right side of the cylinder body is fixedly connected to a hydrostatic bearing by screws, the top of the cylinder body is fixedly connected to a large-flow servo valve plate by screws, the right side of the hydrostatic bearing is fixedly connected to a sleeve by screws, the right side of the sleeve is fixedly connected to a displacement sensor by screws, and the right inner wall gap of the hydrostatic bearing is fitted with a piston rod.

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

[0007] The static pressure bearings are provided in two groups, and the two groups of static pressure bearings are symmetrically distributed along the longitudinal center line of the cylinder body.

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

[0009] The large flow servo valve plates are provided in two groups, and the two groups of large flow servo valve plates are symmetrically distributed along the transverse center line of the cylinder body.

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

[0011] An exhaust hole is provided on the outer wall of the sleeve, and the cylinder body is in a square shape.

[0012] The utility model has the following beneficial effects:

[0013] 1. In the utility model, the rated output load can reach 65T, the test frequency can reach 300Hz, the speed can reach 4m / s, the design flow rate is 6000L / min, the starting pressure is ≤0.001MPa, and two sets of servo valves are connected in parallel to output various physical quantities such as position, speed, and force. The cylinder body adopts a square structure and has high stability, which is suitable for high-speed and large-load arresting impact test systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a high-speed, large-load static pressure support servo actuator proposed by the utility model;

[0015] Figure 2 This is a schematic diagram of the overall main structure of a high-speed, large-load static pressure support servo actuator proposed by the utility model;

[0016] Figure 3 This is a schematic diagram of the overall left-side structure of a high-speed, large-load, static pressure support servo actuator proposed by the utility model;

[0017] Figure 4 This is a schematic diagram of the overall top view structure of a high-speed, large-load static pressure support servo actuator proposed by the utility model.

[0018] Legend:

[0019] 1. Cylinder body; 2. Piston rod; 3. Hydrostatic bearing; 4. Displacement sensor; 5. High-flow servo valve plate; 6. Sleeve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Reference Figure 1-Figure 2The utility model provides an embodiment: a high-speed, large-load hydrostatic support servo actuator, including a cylinder body 1. The cylinder body 1 plays a connecting role and has extremely high precision requirements. The cylinder body 1 has high strength, rigidity and impact toughness, can withstand a hydraulic pressure exceeding 40MPa, a load force exceeding 65T and unexpected impact force, and has a hydraulic buffering function. The right side of the cylinder body 1 is fixedly connected with a hydrostatic bearing 3 by screws. The main function of the hydrostatic bearing 3 is to rely on an external oil supply system to supply pressure oil to the hydrostatic bearing 3, and to transport it to the oil chamber of the hydrostatic bearing 3 through a compensation element, so as to form a lubricating oil film with sufficient pressure to float the piston rod 2, so that the piston rod 2 is always kept at the center position of the hydrostatic bearing 3.

[0022] Reference Figure 3 and Figure 4 The top of the cylinder body 1 is fixedly connected with a large-flow servo valve plate 5 by screws. Through the large-flow servo valve plate 5, an input and output hydraulic oil interface is provided for the high-speed and large-load static pressure support servo actuator. The design flow rate can reach 6000L / min. The right side of the static pressure bearing 3 is fixedly connected with a sleeve 6 by screws. The main function of the sleeve 6 is to protect the tail end piston rod 2 from dust and impurities, and to prevent collision and injury when extending. The right side of the sleeve 6 is fixedly connected with a displacement sensor 4 by screws. The displacement sensor 4 is mainly used to detect and feedback the position signal of the piston rod 2, and to feedback physical quantities such as displacement and speed to the controller.

[0023] Reference Figure 1 The right inner wall gap of the hydrostatic bearing 3 is fitted with a piston rod 2, and the piston rod 2 is gap-sealed with the cylinder body 1 and the hydrostatic bearing 3 through a clearance fit. The piston rod 2 is an important component for transmitting force, and has high strength, rigidity and bending stability. It can withstand various forces such as tension, pressure, bending force and vibration impact.

[0024] Reference Figure 2 and Figure 3 There are two groups of static pressure bearings 3, which are symmetrically distributed along the longitudinal center line of the cylinder body 1. Since the static pressure of the liquid supports the external load, it is ensured that the piston rod 2 is in a state of complete liquid lubrication with the two groups of static pressure bearings 3 at any speed and predetermined load. There are two groups of large-flow servo valve plates 5, which are symmetrically distributed along the transverse center line of the cylinder body 1. The two groups of large-flow servo valve plates 5 are mainly used to install two groups of parallel servo valves.

[0025] Reference Figure 1 and Figure 4 An exhaust hole is provided on the outer wall of the sleeve 6, and air can be exchanged through the exhaust hole under high-speed state to prevent the negative pressure in the sleeve 6 from affecting the test results. The shape of the cylinder body 1 is square, and the cylinder body 1 adopts a square structure, which can improve the overall stability.

[0026] Working principle: When using the servo actuator, firstly, the hydraulic supply device of the external hydraulic oil source is connected through the input hydraulic oil interface set on the large-flow servo valve plate 5 to provide the required hydraulic energy, and the pressure oil is supplied to the hydrostatic bearing 3 through the output hydraulic oil interface set on the large-flow servo valve plate 5. The pressure oil is transported to the oil chamber of the hydrostatic bearing 3 through the compensation element, forming a lubricating oil film with sufficient pressure to float the piston rod 2, so that the piston rod 2 is always kept in the center position of the hydrostatic bearing 3. At the same time, the external load is supported by the static pressure of the liquid, ensuring that the piston rod 2 and the hydrostatic bearing 3 are always kept in a state of complete liquid lubrication.

[0027] Subsequently, two sets of parallel servo valves installed on two sets of large-flow servo valve plates 5 are used to achieve precise control and regulation of the actuator movement. At the same time, the position signal of the piston rod 2 is detected and fed back through the displacement sensor 4 to feed back physical quantities such as displacement and speed to the controller.

[0028] The sleeve 6 protects the rear piston rod 2 to prevent dust and impurities from entering the gap between the piston rod 2 and the static pressure bearing 3 on the right side, and prevents the rear piston rod 2 from hitting and injuring people when it is extended. In the high-speed state, air can be ventilated through the exhaust hole arranged on the sleeve 6 to avoid the negative pressure in the sleeve 6 affecting the test results.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed, high-load, hydrostatic support servo actuator, comprising a cylinder (1), characterized in that: The right side of the cylinder body (1) is fixedly connected to a hydrostatic bearing (3) by means of screws, the top of the cylinder body (1) is fixedly connected to a large flow servo valve plate (5) by means of screws, the right side of the hydrostatic bearing (3) is fixedly connected to a sleeve (6) by means of screws, the right side of the sleeve (6) is fixedly connected to a displacement sensor (4) by means of screws, and the inner wall clearance on the right side of the hydrostatic bearing (3) is fitted with a piston rod (2).

2. A high-speed, high-load, static pressure support servo actuator according to claim 1, characterized in that: The static pressure bearings (3) are provided in two groups, and the two groups of static pressure bearings (3) are symmetrically distributed along the longitudinal center line of the cylinder body (1).

3. The high-speed, high-load, static pressure support servo actuator according to claim 1, characterized in that: Two groups of the large flow servo valve plates (5) are provided, and the two groups of the large flow servo valve plates (5) are symmetrically distributed along the transverse center line of the cylinder body (1).

4. The high-speed, high-load, static pressure support servo actuator according to claim 1, characterized in that: An exhaust hole is provided on the outer wall of the sleeve (6), and the cylinder body (1) is in a square shape.

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