CN110778599A

CN110778599A - High-flexibility high-precision flexible hinge

Info

Publication number: CN110778599A
Application number: CN201911174693.5A
Authority: CN
Inventors: 李成; 王传礼; 蒋浩; 何涛; 陈国瑜; 霍环宇
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-02-11

Abstract

The invention provides a high-flexibility high-precision flexible hinge which comprises a flexible hinge main body and is characterized in that the flexible hinge main body is of a cuboid structure, a curve arc perforation and a rectangular perforation are arranged on the flexible hinge main body, the cutting lengths of the curve arc perforation and the rectangular perforation are different, and the cutting length of the curve arc perforation is smaller than that of the rectangular perforation. The invention adopts the design concept of the mixed flexible hinge, so that the invention has the characteristics of high flexibility and high precision; the rotation capacity of the flexible hinge is further improved by adopting an asymmetric design under the working condition of compact structure; the straight beam section is provided with a pore structure, so that the rotation amplitude is further improved, and the device is more suitable for optical instruments and precision machinery with high flexibility and high precision.

Description

High-flexibility high-precision flexible hinge

Technical Field

The invention relates to the technical field of hinges, in particular to a flexible hinge with high flexibility and high precision.

Background

The flexible hinge has the advantages of no gap, no lubrication, no mechanical friction, compact structure, high sensitivity, high energy conversion rate, high displacement resolution and the like, utilizes the micro deformation generated by the self flexible unit under the action of external force to transmit and convert energy, has elastic restoring force, eliminates friction and retreating idle stroke, and is widely applied to the fields of micro-electromechanical systems, precise machinery, optical engineering, ultra-precision machining, bionic robots, micro-nano positioning and the like. The traditional notch-type flexible hinges can be divided into straight beam-type flexible hinges, elliptical flexible hinges, circular arc-type flexible hinges, hyperbolic flexible hinges, parabolic flexible hinges and the like according to different notch shapes. The performance of different flexible hinges is different, for example, an elliptical flexible hinge has high rotation flexibility but low rotation precision; the arc-shaped flexible hinge has small rotation flexibility but higher rotation precision. The flexible hinge is the smallest unit of the compliant mechanism, and the performance of the flexible hinge directly influences the performance of the compliant mechanism. With the rapid development of the precision manufacturing industry and the micro-nano technology, higher requirements are also put forward on the performance of the flexible hinge, so that the rotation flexibility and the rotation precision of the flexible hinge are to be improved urgently.

Disclosure of Invention

In order to improve the rotation flexibility and the rotation precision of the flexible hinge, the design concept that the traditional flexible hinge is completely symmetrical is broken, the improvement of the rotation range and the rotation precision of the flexible hinge is limited due to the completely symmetrical characteristic, and the flexible hinge with high flexibility and high precision is provided based on the design concept of an asymmetrical flexible hinge and a composite flexible hinge.

The invention adopts the following technical scheme for realizing the purpose:

the utility model provides a flexible hinge of big degree of compliance high accuracy, includes flexible hinge main part, its characterized in that, flexible hinge main part is the cuboid structure, it perforates with the rectangle to be provided with the curve arc in the flexible hinge main part and perforates, the curve arc is perforated and is provided with two, and arranges along the cross axle becomes mirror symmetry, the fenestrate side of curve arc is to the indent, the rectangle is perforated and is provided with two, and arranges along the cross axle becomes mirror symmetry.

Preferably, the cut width of the curved arc perforation and the rectangular perforation is the same, and is the same as the width of the flexible hinge body.

Preferably, the cutting height of the curved arc perforation and the rectangular perforation is the same and less than half of the height of the flexible hinge body.

Preferably, the cutting lengths of the curved arc perforation and the rectangular perforation are different, the cutting length of the curved arc perforation is smaller than the cutting length of the rectangular perforation, and the sum of the cutting lengths of the curved arc perforation and the rectangular perforation is smaller than the length of the flexible hinge body.

Preferably, the curved arc of the curved arc perforation is a curved profile within a quarter cycle of a sine function, and the curved surface of the curved arc perforation is exactly tangent to the plane of the rectangular perforation.

Preferably, the surface of the flexible hinge main body is provided with a pore structure, and the pore structure is a through hole.

Compared with the prior art, the invention has the beneficial effects that: the invention has simple structure, adopts the design concept of the mixed flexible hinge and fully exerts the working performance of the flexible hinge. The asymmetric design is adopted, so that the flexible hinge has the characteristic of adjustable rotation center, and the rotation capacity of the flexible hinge is further improved under the working condition of compact structure. The straight beam section is provided with a pore structure, so that the rotation amplitude is further improved, and the rotation capacity of high flexibility is ensured. Therefore, the deflection angle, the rotation flexibility and the rotation precision of the flexible hinge of the invention are all superior to those of the flexible hinge of the traditional type.

Drawings

FIG. 1 is a schematic structural view of a high-flexibility high-precision flexible hinge provided by the present invention;

FIG. 2 is a schematic front view of a high compliance and high precision flexible hinge according to the present invention;

FIG. 3 is a schematic top view of a flexible hinge with high flexibility and high precision according to the present invention

FIG. 4 is a schematic structural diagram of an embodiment of a high compliance, high precision flexible hinge provided by the present invention;

FIG. 5 is a schematic diagram of a particular embodiment of a prior art elliptical flexible hinge.

In the drawings, 1-the flexible hinge body; 2-punching a curve arc; 3-rectangular perforation; 4-pore structure.

Detailed Description

The invention discloses a high-flexibility high-precision flexible hinge, which adopts the design concept of an asymmetric and composite flexible hinge to ensure higher rotation precision and rotation capability, and an array pore structure is arranged on a straight beam section to further improve the rotation capability of the straight beam section. The invention is further explained below with reference to the drawings and examples.

Referring to fig. 1 to 3, the flexible hinge with high flexibility and high precision provided by the invention comprises a flexible hinge main body 1, and is characterized in that the flexible hinge main body 1 is of a cuboid structure, a curved arc perforation 2 and a rectangular perforation 3 are arranged on the flexible hinge main body 1, the curved arc perforation 2 is provided with two perforations which are arranged in a mirror symmetry manner along a transverse axis, the side surface of the curved arc perforation 2 is concave inwards, and the rectangular perforation 3 is provided with two perforations which are arranged in a mirror symmetry manner along the transverse axis.

Preferably, the cutting widths of the curved arc perforation 2 and the rectangular perforation 3 are the same, and are the same as the width of the flexible hinge body 1.

Preferably, the cutting height of the curved arc perforation 2 and the rectangular perforation 3 is the same, and is less than half of the height of the flexible hinge body 1.

Preferably, the cutting lengths of the curved arc perforation 2 and the rectangular perforation 3 are different, the cutting length of the curved arc perforation 2 is smaller than the cutting length of the rectangular perforation 3, and the sum of the cutting lengths of the curved arc perforation 2 and the rectangular perforation 3 is smaller than the length of the flexible hinge body 1.

Preferably, the curved arc of the curved arc perforation 2 is a curved profile within a quarter period of a sine function, and the curved surface of the curved arc perforation 2 is exactly tangent to the plane of the rectangular perforation 3.

Preferably, the surface of the flexible hinge body 1 is provided with a pore structure 4, and all the pore structures 4 are through holes.

Referring to fig. 4 and 5, under the condition that other geometric parameters (such as minimum thickness, total cutting length, etc.), material properties, load size, etc. are all the same, the performance of the flexible hinge with high flexibility and high precision provided by the present invention is compared with the performance of the conventional elliptical flexible hinge only by changing the shape of the notch. The performance indicators for comparison are deflection angle, rotational flexibility, and rotational accuracy. The definition of each index is as follows:

deflection angle: the deflection angle of the free end under the action of external moment;

rotation flexibility: the ratio of yaw angle to external moment;

rotation precision: the quantitative amount is expressed by the amount of shift of the center of rotation, and the smaller the amount of shift, the higher the accuracy.

The geometric models in fig. 4 and 5 were imported into ANSYS, where the dimensions in units (mm), the material was platinum bronze, the load was 0.01N · m, the deflection was solved, and the comparison results are given in table 1.

Table 1:

type (B)	Deflection angle (rad)	Rotational flexibility (rad/Nm)	Precision of revolution (m)
				Oval shape	0.10306	10.306	2.768×10 ^-5
The invention	0.14183	14.183	7.245×10 ^-6

Through comparison, the flexible hinge disclosed by the invention has the advantages of wider rotation range, greater rotation flexibility and higher rotation precision, and the effectiveness of the flexible hinge disclosed by the invention is verified.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a flexible hinge of big degree of compliance high accuracy, includes flexible hinge main part (1), its characterized in that, flexible hinge main part (1) is the cuboid structure, it perforates (2) and rectangle perforation (3) to be provided with the curve arc on flexible hinge main part (1), curve arc perforation (2) are provided with two, and become mirror symmetry along the cross axle and arrange, the side of curve arc perforation (2) is to the indent, rectangle perforation (3) are provided with two, and become mirror symmetry along the cross axle and arrange.

2. A high flexibility high precision flexible hinge according to claim 1 characterized in that the cut width of the curved arc perforation (2) and the rectangular perforation (3) are the same and the same as the width of the flexible hinge body (1).

3. A high flexibility high precision flexible hinge according to claim 1 characterized in that the cutting height of the curved arc perforation (2) and the rectangular perforation (3) is the same and less than half of the height of the flexible hinge body (1).

4. A high flexibility high precision flexible hinge according to claim 1, characterized in that the cutting length of the curved arc perforation (2) and the rectangular perforation (3) are different, the cutting length of the curved arc perforation (2) is smaller than the cutting length of the rectangular perforation (3), and the sum of the cutting lengths of the curved arc perforation (2) and the rectangular perforation (3) is smaller than the length of the flexible hinge body (1).

5. A high flexibility high precision flexible hinge according to claim 1 characterized in that the curved arc of said curved arc perforation (2) is a curved profile within a quarter cycle of a sine function and the curved surface of the curved arc perforation (2) is exactly tangent to the plane of the rectangular perforation (3).

6. A high flexibility high precision flexible hinge according to claim 1, characterized in that the surface of the flexible hinge body (1) is provided with pore structures (4), the pore structures (4) are all through holes, and the axis of each through hole is along the vertical direction.