Three-cavity static pressure supporting servo actuator

Abstract

The utility model relates to the field of static pressure support, and discloses a three-cavity static pressure support servo actuator which comprises a force sensor, a piston rod is installed at the bottom end of the force sensor, a static pressure bearing is installed at the bottom end of the piston rod, a cylinder body is installed at the bottom end of the static pressure bearing, and a control assembly is arranged at the front end of the cylinder body. A pressurizing assembly is arranged at the bottom end of the cylinder body and comprises a pressurizing barrel, the top end of the pressurizing barrel is installed at the bottom end of the cylinder body, a pressurizing cavity valve block is installed at the rear end of the pressurizing barrel, multiple sets of bag type energy accumulators are installed at the top end of the pressurizing cavity valve block, and a guide mechanism is arranged at the left end of the cylinder body. According to the utility model, by additionally arranging the two groups of bag type energy accumulators, before servo driving, the two groups of bag type energy accumulators can be charged to keep a certain preloading force to balance the self weight of the device, so that the driving can be realized by using an actuator with lower load, and the overall cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of hydrostatic support, in particular to a three-chamber hydrostatic support servo actuator. Background Technique

[0002] A servo actuator is a kind of electromechanical equipment widely used in automatic control systems. It can accurately drive a load to achieve specific motions according to the input control signals. At the same time, the servo actuator itself has high precision. With its characteristics of high precision, high response speed and high reliability, it has become an indispensable key equipment in many fields such as modern industry, aerospace, and automobile manufacturing, and has strongly promoted the automation and intelligent development of various industries.

[0003] At present, most of the servo actuators on the market are of two-chamber structure. Affected by seals and structures, they have large frictional forces and relatively large losses in actual output forces. The starting pressure is generally greater than 0.2 MPa, and the frequency generally does not exceed 100 Hz. For working conditions with low load requirements but heavy equipment self-weight and the need to balance the equipment self-weight, when configuring a servo actuator, it is necessary to select a servo actuator with a load far exceeding the system's required load, which will lead to increased costs and waste. Therefore, a three-chamber hydrostatic support servo actuator is proposed to solve the above problems. Summary of the Utility Model

[0004] In order to make up for the above deficiencies, the utility model provides a three-chamber hydrostatic support servo actuator, aiming to improve the problem in the prior art that "for working conditions with low load requirements but heavy equipment self-weight and the need to balance the equipment self-weight, it is necessary to select a servo actuator with a load far exceeding the system's required load, which will lead to increased costs".

[0005] To achieve the above object, the utility model adopts the following technical scheme: A three-chamber hydrostatic support servo actuator includes a force sensor. A piston rod is installed at the bottom end of the force sensor. A hydrostatic bearing is installed at the bottom end of the piston rod. A cylinder block is installed at the bottom end of the hydrostatic bearing. A control component is arranged at the front end of the cylinder block. A boosting component is arranged at the bottom end of the cylinder block. The boosting component includes a boosting cylinder. The top end of the boosting cylinder is installed at the bottom end of the cylinder block. A boosting chamber valve block is installed at the rear end of the boosting cylinder. A plurality of bladder accumulators are installed at the top end of the boosting chamber valve block. A guiding mechanism is arranged at the left end of the cylinder block. A bottom plate is installed at the bottom end of the boosting cylinder. A displacement sensor is installed at the right end of the piston rod. The bottom end of the displacement sensor is installed at the right end of the cylinder block.

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

[0007] The control component includes a control valve plate. The control valve plate is installed at the front end of the cylinder block. The boosting cylinder and the control valve plate are connected to each other through a connecting pipe.

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

[0009] A servo valve is installed near the middle position at the front end of the control valve plate, and the number of servo valves is multiple groups.

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

[0011] An electromagnetic valve is installed at the front end of the control valve plate, and the number of electromagnetic valves is multiple groups.

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

[0013] A differential pressure sensor is installed at the front end of the control valve plate, a high-pressure filter is installed at the right end of the control valve plate, and diaphragm accumulators are installed at the bottom end of the control valve plate, and the number of diaphragm accumulators is multiple groups.

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

[0015] The guiding mechanism includes a guiding rod, and the top end of the guiding rod is fixedly connected to the left end of the piston rod.

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

[0017] A guiding frame is fixedly connected to the left end of the piston rod, and the guiding mechanism slides on the inner wall of the guiding frame.

[0018] As a further description of the above technical solution:

[0019] A guiding sleeve is fixedly connected to the left end of the cylinder block, and the bottom end of the guiding rod slides on the inner wall of the guiding sleeve.

[0020] The utility model has the following beneficial effects:

[0021] 1. In the utility model, by additionally adding two sets of bladder accumulators, before servo drive, the two sets of bladder accumulators can be charged to maintain a certain preload force to balance the self-weight of the device. In this way, actuators with lower loads can be used to achieve drive, which can reduce the overall cost. Description of the Drawings

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the overall device in the utility model;

[0023] Figure 2 It is a front view schematic diagram of the overall device in the utility model;

[0024] Figure 3 It is a side view schematic diagram of the overall device in the utility model;

[0025] Figure 4This is a top view schematic diagram of the overall device in the present utility model.

[0026] Legend description:

[0027] 1. Force sensor; 2. Piston rod; 3. Hydrostatic bearing; 4. Cylinder block; 5. Servo valve; 6. Differential pressure sensor; 7. Solenoid valve; 8. Diaphragm accumulator; 9. Booster cylinder; 10. Base plate; 11. High-pressure filter; 12. Guide mechanism; 121. Guide rod; 122. Guide frame; 123. Guide sleeve; 13. Bladder accumulator; 14. Booster chamber valve block; 15. Control valve plate; 16. Displacement sensor. Specific implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Refer to Figure 1 , Figure 2 and Figure 4, an embodiment provided by the present utility model: a three-chamber hydrostatic support servo actuator, including a force sensor 1. The force sensor 1 adopts a spoke structure and has excellent dynamic performance. The force sensor 1 is used for measuring the force value in the overall device and feeding back physical quantities such as the force value to the controller. A piston rod 2 is installed at the bottom end of the force sensor 1. The force sensor 1 is connected to the piston rod 2 through threads. A hydrostatic bearing 3 is installed at the bottom end of the piston rod 2. 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 through a compensation element, it is transported to the oil chamber of the hydrostatic bearing 3 to form a lubricating oil film with sufficient pressure to float the piston rod 2, so that the piston rod 2 always remains at the center position of the hydrostatic bearing 3. The external load is supported by the static pressure of the liquid, ensuring that the piston rod 2 is in a fully liquid lubrication state with the hydrostatic bearing 3 at any speed and under a predetermined load. A cylinder block 4 is installed at the bottom end of the hydrostatic bearing 3. The piston rod 2 is clearance-sealed with the hydrostatic bearing 3 and the cylinder block 4 through clearance fit. The piston rod 2 is an important component for transmitting force in the overall device, with high strength, stiffness, and bending stability, and can withstand various acting forces such as tensile force, pressure, bending force, and vibration shock. The cylinder block 4 is a key component in the overall device, playing a connecting role and having extremely high precision requirements. The cylinder block 4 has high strength, stiffness, and impact toughness, can withstand a hydraulic pressure exceeding 40 MPa, a load force exceeding 10 T, and accidental impact forces, and has a hydraulic buffering function. A control component is provided at the front end of the cylinder block 4, and a pressurizing component is provided at the bottom end of the cylinder block 4. The pressurizing component includes a pressurizing cylinder 9. The main function of the pressurizing cylinder 9 is to serve as a pressurizing chamber for the overall device, and can provide a certain preload force to balance the self-weight of the equipment. The top end of the pressurizing cylinder 9 is installed at the bottom end of the cylinder block 4. A pressurizing chamber valve block 14 is installed at the rear end of the pressurizing cylinder 9. The main function of the pressurizing cylinder 9 is to transmit oil to the pressurizing chamber to ensure the normal operation of the pressurizing chamber. Multiple sets of bladder accumulators 13 are installed at the top end of the pressurizing chamber valve block 14. The main function of the bladder accumulators 13 is to store energy, stabilize pressure, and absorb shock for the pressurizing chamber. A guiding mechanism 12 is provided at the left end of the cylinder block 4. The main function of the guiding mechanism 12 is to provide an accurate and stable movement path for an external displacement sensor, play a guiding role, and provide an anti-rotation function for the overall device. A bottom plate 10 is installed at the bottom end of the pressurizing cylinder 9. The main function of the bottom plate 10 is to provide a stable working platform for supporting the load, installation, and positioning to ensure the stability of the overall device. A displacement sensor 16 is installed at the right end of the piston rod 2, and its main function is to detect and feedback the position signal of the piston rod 2, and feed back physical quantities such as displacement and speed to the control component. The bottom end of the displacement sensor 16 is installed at the right end of the cylinder block 4.

[0030] Refer to Figure 1 - Figure 3, the control component includes a control valve plate 15. The main function of the control valve plate 15 is to integrate the servo valve 5 and other components, and is used to control various motion states of the overall device. The control valve plate 15 is installed at the front end of the cylinder block 4. The booster cylinder 9 is connected to the control valve plate 15 through a connecting pipe. At a position near the middle of the front end of the control valve plate 15, multiple groups of servo valves 5 are installed. The servo valve 5 is a key component for achieving precise motion control and force control in the overall device, with fast dynamic response capabilities and can achieve high-frequency vibration control. At the front end of the control valve plate 15, multiple groups of solenoid valves 7 are installed. The solenoid valve 7 can quickly respond to control signals, rapidly change the motion state of the fluid, protect the system, and is used to achieve the emergency unloading protection function. At the front end of the control valve plate 15, a differential pressure sensor 6 is installed. The differential pressure sensor 6 is used to accurately measure the pressure difference on both sides of the piston, quickly respond to pressure changes, improve the dynamic response ability of the overall device, and at the same time, as a tool for status detection and fault diagnosis, by analyzing the change of the pressure difference, identify potential risks of the system and provide feedback. At the right end of the control valve plate 15, a high-pressure filter 11 is installed. The main function of the high-pressure filter 11 is to filter impurities in the oil fluid, ensure that the cleanliness of the oil fluid meets the usage requirements, and guarantee the long-term stable operation of the overall device. At the bottom end of the control valve plate 15, multiple groups of diaphragm accumulators 8 are installed. The main function of the diaphragm accumulator 8 is to absorb shocks, balance pressure fluctuations, and improve the response speed of the system.

[0031] Referring to Figure 1 - Figure 3 , the guiding mechanism 12 includes a guiding rod 121. The top end of the guiding rod 121 is fixedly connected to the left end of the piston rod 2. When the piston rod 2 moves up and down, it will drive the guiding rod 121 to move synchronously. A guiding frame 122 for restricting the movement trajectory of the piston rod 2 is fixedly connected to the left end of the piston rod 2. The guiding mechanism 12 slides inside the inner wall of the guiding frame 122. By setting the guiding frame 122, the guiding rod 121 can be guided to move vertically up and down. A guiding sleeve 123 for accommodating the guiding rod 121 is fixedly connected to the left end of the cylinder block 4. The bottom end of the guiding rod 121 slides inside the inner wall of the guiding sleeve 123.

[0032] Working principle: When the overall device is operating, it is necessary to first connect the device to be moved to the force sensor 1, then adjust the servo valve 5 to allow the hydraulic oil to enter the inside of the pressure intensifying cylinder 9, and then control the hydraulic oil to enter the inside of the pressure intensifying chamber valve block 14 to charge the bladder accumulator 13. When the internal pressure of the bladder accumulator 13 is sufficient to balance the self-weight of the device, the charging can be stopped. Subsequently, another group of servo valves 5 can be adjusted to control the hydraulic oil to enter the inside of the cylinder block 4 to drive the piston rod 2 to move upward for operation. As the piston rod 2 moves up and down continuously, the bladder accumulator 13 will drive the hydraulic oil to enter or leave the inside of the pressure intensifying cylinder 9 through the pressure intensifying chamber valve block 14 to balance the self-weight of the device. Since the bladder accumulator 13 is used to balance the self-weight of the device, there is no need to select a servo actuator with a load far exceeding the system demand load during use, thus reducing costs.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention 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 perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-chamber hydrostatic support servo actuator, comprising a force sensor (1), characterized in that: The bottom end of the force sensor (1) is equipped with a piston rod (2). The bottom end of the piston rod (2) is equipped with a hydrostatic bearing (3). The bottom end of the hydrostatic bearing (3) is equipped with a cylinder block (4). A control assembly is provided at the front end of the cylinder block (4). A boosting assembly is provided at the bottom end of the cylinder block (4). The boosting assembly includes a boosting cylinder (9). The top end of the boosting cylinder (9) is installed at the bottom end of the cylinder block (4). A boosting chamber valve block (14) is installed at the rear end of the boosting cylinder (9). A plurality of bladder accumulators (13) are installed at the top end of the boosting chamber valve block (14). A guiding mechanism (12) is provided at the left end of the cylinder block (4). The bottom end of the boosting cylinder (9) is installed with a bottom plate (10). A displacement sensor (16) is installed at the right end of the piston rod (2). The bottom end of the displacement sensor (16) is installed at the right end of the cylinder block (4).

2. The three-chamber hydrostatic support servo actuator according to claim 1, characterized in that: The control assembly includes a control valve plate (15). The control valve plate (15) is installed at the front end of the cylinder block (4). The boosting cylinder (9) and the control valve plate (15) are connected to each other through a connecting pipe.

3. The three-chamber hydrostatic support servo actuator according to claim 2, characterized in that: A plurality of servo valves (5) are installed near the middle position at the front end of the control valve plate (15).

4. A three-chamber hydrostatic support servo actuator according to claim 2, characterized in that: A plurality of solenoid valves (7) are installed at the front end of the control valve plate (15).

5. A three-chamber hydrostatic support servo actuator according to claim 2, characterized in that: A differential pressure sensor (6) is installed at the front end of the control valve plate (15). A high-pressure filter (11) is installed at the right end of the control valve plate (15). A plurality of diaphragm accumulators (8) are installed at the bottom end of the control valve plate (15).

6. The three-chamber hydrostatic support servo actuator according to claim 1, wherein: The guiding mechanism (12) includes a guiding rod (121). The top end of the guiding rod (121) is fixedly connected to the left end of the piston rod (2).

7. The three-chamber hydrostatic support servo actuator according to claim 6, characterized in that: A guiding frame (122) is fixedly connected to the left end of the piston rod (2). The guiding mechanism (12) slides inside the inner wall of the guiding frame (122).

8. A three-chamber hydrostatic support servo actuator according to claim 6, characterized in that: A guiding sleeve (123) is fixedly connected to the left end of the cylinder block (4). The bottom end of the guiding rod (121) slides inside the inner wall of the guiding sleeve (123).

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