阅读说明：本技术 一种应用于航空航天的直线压电传动装置及其工作方法 (Linear piezoelectric transmission device applied to aerospace and working method thereof ) 是由 原路生 汪国庆 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种应用于航空航天的直线压电传动装置及其工作方法,涉及压电驱动领域,该装置包含壳体、2个直线轴承、输出轴、4个安装座和2个压电驱动单元。输出轴为光柱；压电驱动单元包含两个相同的用于给输出轴施加相反推力的压电驱动单元,压电驱动单元包含依次相连的第一柔性铰链、压电促动器、第二柔性铰链和摩擦块。通过控制压电促动器运动的时序,使摩擦块产生固定步序的周期运动,在摩擦块与输出轴间静摩擦力的作用下使输出轴产生正反、向直线运动,从而实现装置的正、反向运动工作。本发明可靠性高、输出推力大、精度高,通用性较好,易于应用于航空航天超精密驱动领域,具有良好的经济效益。(The invention discloses a linear piezoelectric transmission device applied to aerospace and a working method thereof, and relates to the field of piezoelectric drive. The output shaft is a light column; the piezoelectric driving unit comprises two identical piezoelectric driving units which are used for applying opposite thrust to the output shaft, and the piezoelectric driving units comprise a first flexible hinge, a piezoelectric actuator, a second flexible hinge and a friction block which are connected in sequence. The friction block is made to produce periodic motion in fixed step by controlling the motion time sequence of the piezoelectric actuator, and the output shaft is made to produce forward and reverse linear motion under the action of the static friction force between the friction block and the output shaft, so as to realize the forward and reverse motion of the device. The invention has the advantages of high reliability, large output thrust, high precision and better universality, is easy to be applied to the field of aerospace ultra-precise driving and has good economic benefit.)

1. A linear piezoelectric transmission device applied to aerospace and a working method thereof are characterized by comprising a shell, a linear bearing, an output shaft, a mounting seat and first to second piezoelectric driving units;

the two ends of the output shaft are provided with connecting keys for connecting with the outside;

the shell is a hollow cylinder with two closed ends;

the centers of two sides of the shell are respectively provided with mounting holes corresponding to the linear bearings one by one, and the linear bearings are mounted in the mounting holes of the centers of two sides of the shell in a one-to-one correspondence manner;

the output shaft is connected with the shell through a linear bearing and can freely slide relative to the shell;

the mounting seats are circumferentially and uniformly arranged on the inner wall of the side wall of the shell;

the first piezoelectric driving unit and the second piezoelectric driving unit have the same structure and respectively comprise a first flexible hinge, a piezoelectric actuator, a second flexible hinge and a friction block; the friction block comprises a connecting part and a friction part, wherein the friction part is an arc surface matched with the side wall of the output shaft and is used for abutting against the side wall of the output shaft and driving the output shaft to slide through static friction; one end of the connecting part is connected with the friction part, and the other end of the connecting part is connected with one end of the second flexible hinge; one end of the piezoelectric actuator is connected with the other end of the second flexible hinge, and the other end of the piezoelectric actuator is connected with one end of the first flexible hinge; the first flexible hinge and the second flexible hinge are both used for bending and steering so as to ensure that no sliding friction occurs between the friction block and the output shaft;

the first piezoelectric driving module, the second piezoelectric driving module, the third piezoelectric driving module, the fourth piezoelectric driving module, the fifth piezoelectric driving module, the sixth piezoelectric driving module, the seventh piezoelectric driving module, the sixth piezoelectric driving module, the fourth piezoelectric driving module, the sixth piezoelectric driving module, the fourth piezoelectric driving module, and the fourth piezoelectric driving module, and the sixth piezoelectric driving module, the fourth piezoelectric driving module, the sixth piezoelectric module, the fourth piezoelectric module, the sixth piezoelectric module, and the sixth piezoelectric module, the fourth piezoelectric module, and the fourth piezoelectric module, and the fourth, and the sixth, and the fourth piezoelectric module, and the fourth, the fourth piezoelectric driving module, the fourth, and the fourth, andfixedly connected, friction parts of friction blocks in the first piezoelectric driving unit and the second piezoelectric driving unit are coaxially arranged with the output shaft, and the distance between the friction parts and the output shaft is a preset first distance threshold value l₁(ii) a The first piezoelectric driving unit and the second piezoelectric driving unit are used for applying thrust to the output shaft, and the thrust applied by the first piezoelectric driving unit and the thrust applied by the second piezoelectric driving unit are the same in magnitude and opposite in direction.

2. The linear piezoelectric transmission device applied to aerospace and the working method thereof based on the claim 1 are characterized by comprising the following steps:

step 1), driving a first piezoelectric driving unit to work to enable the first piezoelectric driving unit to axially extend, and enabling a friction part of a friction block of the first piezoelectric driving unit to be abutted against an output shaft;

step 2), the first piezoelectric driving unit is continuously driven to work to enable the first piezoelectric driving unit to axially extend, at the moment, the friction part of the friction block of the first piezoelectric driving unit and the output shaft are kept static mutually under the action of static friction force, and the output shaft is driven to move horizontally for a distance l in the axial direction₂；

Step 3), driving the first piezoelectric driving unit to work to axially shorten the first piezoelectric driving unit, so that the friction part of the friction block of the first piezoelectric driving unit in the first to fourth piezoelectric driving modules is separated from the output shaft, and the distance between the friction part and the output shaft is a preset first distance threshold value l₁；

And 4) repeatedly executing the steps 1) to 3) until the output distance of the linear piezoelectric transmission device is equal to the target distance.

Technical Field

The invention relates to the field of piezoelectric driving, in particular to a linear piezoelectric transmission device applied to aerospace and a working method thereof.

Background

The piezoelectric transmission device is a linear piezoelectric transmission device applied to aerospace, and has extremely wide application in the aerospace field due to the characteristics of high corresponding speed, high precision, stepless speed regulation and the like. However, because of its low power, it can only be used as a transmission of miniature parts in use. Therefore, how to increase the power of the piezoelectric actuator and further improve the output thrust and the load force becomes a main problem facing the piezoelectric actuator to further widen the application range and improve the performance of the device.

Disclosure of Invention

The invention aims to solve the technical problem of providing a linear piezoelectric transmission device applied to aviation and a working method thereof aiming at the defects involved in the background technology.

The invention adopts the following technical scheme for solving the technical problems:

a linear piezoelectric transmission device applied to aerospace and a working method thereof comprise a shell, a linear bearing, an output shaft, a mounting seat and first to second piezoelectric driving units;

the two ends of the output shaft are provided with connecting keys for connecting with the outside;

the shell is a hollow cylinder with two closed ends;

the centers of two sides of the shell are respectively provided with mounting holes corresponding to the linear bearings one by one, and the linear bearings are mounted in the mounting holes of the centers of two sides of the shell in a one-to-one correspondence manner;

the output shaft is connected with the shell through a linear bearing and can freely slide relative to the shell;

the mounting seats are circumferentially and uniformly arranged on the inner wall of the side wall of the shell;

the first piezoelectric driving unit and the second piezoelectric driving unit have the same structure and respectively comprise a first flexible hinge, a piezoelectric actuator, a second flexible hinge and a friction block; the friction block comprises a connecting part and a friction part, wherein the friction part is an arc surface matched with the side wall of the output shaft and is used for abutting against the side wall of the output shaft and driving the output shaft to slide through static friction; one end of the connecting part is connected with the friction part, and the other end of the connecting part is connected with one end of the second flexible hinge; one end of the piezoelectric actuator is connected with the other end of the second flexible hinge, and the other end of the piezoelectric actuator is connected with one end of the first flexible hinge; the first flexible hinge and the second flexible hinge are both used for bending and steering so as to ensure that no sliding friction occurs between the friction block and the output shaft;

the first piezoelectric driving module, the second piezoelectric driving module, the first distance threshold value l, the second distance threshold value l and the first flexible hinge are arranged on the installation seat in a one-to-one correspondence mode, the other end of the first flexible hinge in the first piezoelectric driving unit and the second piezoelectric driving unit is fixedly connected with the corresponding installation seat, the friction portions of the friction blocks in the first piezoelectric driving unit and the second piezoelectric driving unit are coaxially arranged with the output shaft, and the distance between the friction portions and the output shaft is a preset first distance threshold value l₁(ii) a The first piezoelectric driving unit and the second piezoelectric driving unit are used for applying thrust to the output shaft, and the thrust applied by the first piezoelectric driving unit and the thrust applied by the second piezoelectric driving unit are the same in magnitude and opposite in direction.

Further, the linear piezoelectric transmission device applied to aerospace and the working method thereof comprise the following steps:

step 1), driving a first piezoelectric driving unit to work to enable the first piezoelectric driving unit to axially extend, and enabling a friction part of a friction block of the first piezoelectric driving unit to be abutted against an output shaft;

step 2), the first piezoelectric driving unit is continuously driven to work to enable the first piezoelectric driving unit to axially extend, at the moment, the friction part of the friction block of the first piezoelectric driving unit and the output shaft are kept static mutually under the action of static friction force, and the output shaft is driven to move horizontally for a distance l in the axial direction₂；

Step 3), driving the first piezoelectric driving unit to work to axially shorten the first piezoelectric driving unit, so that the friction part of the friction block of the first piezoelectric driving unit in the first to fourth piezoelectric driving modules is separated from the output shaft, and the distance between the friction part and the output shaft is a preset first distance threshold value l₁；

And 4) repeatedly executing the steps 1) to 3) until the output distance of the linear piezoelectric transmission device is equal to the target distance.

In a positive motion period, the output shaft of the linear piezoelectric transmission device is extended together₂The reverse principle is the same.

Compared with the prior art, the invention adopting the technical scheme has the following technical effects:

1. the device is provided with the two groups of piezoelectric actuators, and the output shaft is driven to output in the forward direction or the reverse direction by virtue of static friction force, so that the purposes of high thrust and high precision of the device are achieved, and the device is suitable for the ultra-precise driving field of aerospace;

2. the piezoelectric actuator is used as an excitation source, so that the piezoelectric actuator has high response speed and high precision, and can adjust the speed by changing the input frequency.

Drawings

Fig. 1 is an external view schematically showing the present invention.

Fig. 2 is a schematic cross-sectional view of the structure of the present invention.

Fig. 3 is a schematic view of the structure of the output shaft of the present invention.

Fig. 4 is an external view of the housing of the present invention.

Fig. 5 is a schematic cross-sectional view of the housing of the present invention.

Fig. 6 is a schematic structural view of the flexible hinge of the first piezoelectric driving unit in the present invention.

Fig. 7 is a schematic structural view of a friction block of the first piezoelectric driving unit in the present invention.

Fig. 8 is a driving operation diagram of the present invention.

In the figure, 1-output shaft, 2-housing, 3-mounting seat, 4-friction block of first piezoelectric driving unit, 5-flexible hinge of first piezoelectric driving unit, 6-piezoelectric actuator of first piezoelectric driving unit, 7-piezoelectric actuator of second piezoelectric driving unit, 8-flexible hinge of second piezoelectric driving unit, 9-friction block of second piezoelectric driving unit, 10-linear bearing.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the attached drawings:

the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

As shown in fig. 1 and 2, the present invention discloses a linear piezoelectric actuator for aerospace and a working method thereof, including a housing, a linear bearing, an output shaft, a mounting seat, and first to second piezoelectric driving units;

as shown in fig. 3, the output shaft is provided at both ends with a connection key for connection with the outside.

As shown in fig. 4 and 5, the housing is a hollow cylinder with two closed ends;

the mounting seats are circumferentially and uniformly arranged on the inner wall of the side wall of the shell;

the output shaft is connected with the shell through a linear bearing and can freely slide relative to the shell;

as shown in fig. 8, the piezoelectric driving unit includes a first piezoelectric driving unit and a second piezoelectric driving unit.

The first piezoelectric driving unit and the second piezoelectric driving unit have the same structure and respectively comprise a first flexible hinge, a piezoelectric actuator, a second flexible hinge and a friction block; the friction block comprises a connecting part and a friction part, wherein the friction part is an arc surface matched with the side wall of the output shaft and is used for abutting against the side wall of the output shaft and driving the output shaft to slide through static friction; one end of the connecting part is connected with the friction part, and the other end of the connecting part is connected with one end of the second flexible hinge; one end of the piezoelectric actuator is connected with the other end of the second flexible hinge, and the other end of the piezoelectric actuator is connected with one end of the first flexible hinge; the first flexible hinge and the second flexible hinge are used for bending and steering to ensure that sliding friction does not occur between the friction block and the output shaft, and the structure of the flexible hinge is shown in figure 6.

The first piezoelectric driving module, the second piezoelectric driving module, the first distance threshold value l, the second distance threshold value l and the first flexible hinge are arranged on the installation seat in a one-to-one correspondence mode, the other end of the first flexible hinge in the first piezoelectric driving unit and the second piezoelectric driving unit is fixedly connected with the corresponding installation seat, the friction portions of the friction blocks in the first piezoelectric driving unit and the second piezoelectric driving unit are coaxially arranged with the output shaft, and the distance between the friction portions and the output shaft is a preset first distance threshold value l₁(ii) a First and second piezoelectric drive unitsThe driving units are used for applying thrust to the output shaft, and the thrust applied by the first piezoelectric driving unit and the thrust applied by the second piezoelectric driving unit are the same in magnitude and opposite in direction.

As shown in fig. 8, the invention also discloses a linear piezoelectric actuator applied to aerospace and a working method thereof, comprising the following steps:

step 1), driving a first piezoelectric driving unit to work to enable the first piezoelectric driving unit to axially extend, and enabling a friction part of a friction block of the first piezoelectric driving unit to be abutted against an output shaft;

step 2), the first piezoelectric driving unit is continuously driven to work to enable the first piezoelectric driving unit to axially extend, at the moment, the friction part of the friction block of the first piezoelectric driving unit and the output shaft are kept static mutually under the action of static friction force, and the output shaft is driven to move horizontally for a distance l in the axial direction₂；

Step 3), driving the first piezoelectric driving unit to work to axially shorten the first piezoelectric driving unit, so that the friction part of the friction block of the first piezoelectric driving unit in the first to fourth piezoelectric driving modules is separated from the output shaft, and the distance between the friction part and the output shaft is a preset first distance threshold value l₁；

And 4) repeatedly executing the steps 1) to 3) until the output distance of the linear piezoelectric transmission device is equal to the target distance.

In a positive motion period, the output shaft of the linear piezoelectric transmission device is extended together₂The reverse principle is the same.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.