阅读说明：本技术 平面复合结构空间大行程柔顺铰链及柔顺并联机构 (Planar composite structure space large-stroke flexible hinge and flexible parallel mechanism ) 是由 张宪民 张洪川 吴衍傧 詹镇辉 李海 朱本亮 于 2020-12-28 设计创作，主要内容包括：本发明公开了一种平面复合结构空间大行程柔顺铰链及柔顺并联机构,其中,平面复合结构空间大行程柔顺铰链包括有铰链本体、固定在铰链本体上的移动副单元和若干转动副单元,其中,移动副单元通过一对固定梁的一对变形梁构成平行四边形结构,变形梁弯曲变形后能够实现对平面内的弯曲运动的传递,再者,转动副单元设置为矩形结构,且转动副单元的厚度与铰链本体的厚度之比不大于0.5,故转动副单元的扭转柔度高,通过其扭转变形能实现平面外的大范围转动,在转动副单元和移动副单元的配合下,使该柔顺铰链得以进行平面外大行程转动和平面内大行程移动的复合运动。(The invention discloses a planar composite structure space large-stroke flexible hinge and a flexible parallel mechanism, wherein the planar composite structure space large-stroke flexible hinge comprises a hinge body, a moving auxiliary unit and a plurality of rotating auxiliary units, wherein the moving auxiliary units and the rotating auxiliary units are fixed on the hinge body, wherein, the mobile auxiliary unit forms a parallelogram structure through a pair of deformation beams of a pair of fixed beams, the deformation beams can realize the transmission of bending motion in a plane after bending deformation, moreover, the rotary auxiliary unit is arranged to be a rectangular structure, and the ratio of the thickness of the rotary pair unit to the thickness of the hinge body is not more than 0.5, so that the rotary pair unit has high torsional flexibility, can realize out-of-plane large-range rotation through torsional deformation, under the coordination of the rotating auxiliary unit and the moving auxiliary unit, the flexible hinge can perform compound motion of out-of-plane large-stroke rotation and in-plane large-stroke movement.)

1. The planar composite structure space large-stroke flexible hinge is characterized in that: comprises that

A hinge body;

the movable auxiliary unit is arranged on the hinge body and is provided with a pair of fixed beams and a pair of deformation beams, and the fixed beams and the deformation beams are connected to form a parallelogram structure; and

the hinge body is provided with a plurality of rotating auxiliary units, the rotating auxiliary units are respectively embedded on the hinge body, the cross section of each rotating auxiliary unit is rectangular, each rotating auxiliary unit comprises a pair of long beams and a pair of short beams, and the ratio of the width of each long beam to the thickness of the hinge body is not more than 0.5.

2. The planar composite structure space large-stroke compliant hinge of claim 1, wherein: the ratio of the width of the long beam to the thickness of the hinge body is 0.3 to 0.5.

3. The planar composite structure space large-stroke compliant hinge of claim 2, wherein: the length ratio of the long beam to the short beam is 2-5.

4. The planar composite structure space large-stroke compliant hinge of claim 3, wherein: the middle section of each long beam is fixedly connected to the hinge body, and two ends of each long beam are separated from the hinge body.

5. The planar composite structure space large-stroke compliant hinge of claim 3, wherein: the width of the long beam is smaller than that of the short beam.

6. The planar composite structure space large-stroke compliant hinge of claim 1, wherein: the width of the deformation beam is equal to that of the long beam, and the length of the deformation beam is greater than that of the fixed beam.

7. The planar composite structure space large-stroke compliant hinge of claim 6, wherein: the ratio of the lengths of the deformation beam and the fixed beam ranges from [3, 4 ].

8. The planar composite structure space large-stroke compliant hinge of claim 6, wherein: the cross section of the moving auxiliary unit is rectangular.

9. The compliant parallel mechanism is characterized in that: comprises that

A terminal platform; and

three groups of the planar composite structure space large-stroke flexible hinges of any one of claims 1 to 8, distributed around the end platforms and respectively connected with the end platforms, and adjacent planar composite structure space large-stroke flexible hinges are connected through a fixing structure.

10. The compliant parallel mechanism of claim 9 wherein: the planar composite structure space large-stroke compliant hinges are distributed around the tail end platform at equal angles.

Technical Field

The invention relates to the field of compliant mechanisms, in particular to a planar composite structure space large-stroke compliant hinge and a compliant parallel mechanism.

Background

The compliant mechanism refers to a mechanism which transmits input force or displacement by utilizing elastic deformation of the compliant mechanism. The compliant mechanism has the advantages of no gap, no lubrication, no assembly, high precision, high rigidity and the like, so the compliant mechanism is widely applied to the fields of aerospace, mechanical engineering, robot science, medical equipment and the like.

Most of the compliant hinges or mechanisms with planar structures can only realize the movement in the plane of the structure, but the compliant mechanisms and hinges with space movement capability are not simple planar structures, which causes the difficulty in processing the space compliant mechanisms or compliant hinges and the difficulty in realizing small-scale processing or manufacturing.

To solve the above problems, the prior art has developed a compliant mechanism of the LEMs composed of compliant hinges of the LET, which has the characteristic of realizing out-of-plane spatial motion through a planar structure, can realize large deformation, and is simple to process. However, the LET compliant hinge is equivalent to a single-degree-of-freedom joint of a rigid mechanism, so that the equivalent rigid mechanism of the LEMs compliant mechanism is often a spatial few-degree-of-freedom mechanism composed of low kinematic pairs, and therefore, in designing a large-stroke spatial multiple-degree-of-freedom compliant mechanism compounded by planar sheets, the LET compliant hinge has the limitation that the rotation flexibility in the normal direction of a structural plane cannot be realized.

Disclosure of Invention

The invention aims to solve at least one technical problem in the prior art and provides a planar composite structure space large-stroke flexible hinge which is simple in structure and high in rotation flexibility.

The invention also provides a compliant parallel mechanism with the planar composite structure space large-stroke compliant hinge.

The planar composite structure space large-stroke compliant hinge comprises a hinge body; the movable auxiliary unit is arranged on the hinge body and is provided with a pair of fixed beams and a pair of deformation beams, and the fixed beams and the deformation beams are connected to form a parallelogram structure; and the plurality of rotating auxiliary units are respectively embedded on the hinge body, the cross section of each rotating auxiliary unit is rectangular, each rotating auxiliary unit comprises a pair of long beams and a pair of short beams, and the ratio of the width of each long beam to the thickness of the hinge body is not more than 0.5.

The planar composite structure space large-stroke compliant hinge provided by the embodiment of the invention at least has the following beneficial effects: the spatial large-stroke flexible hinge with the planar composite structure comprises a hinge body, a moving auxiliary unit and a plurality of rotating auxiliary units, wherein the moving auxiliary unit and the rotating auxiliary units are fixed on the hinge body, the moving auxiliary unit forms a parallelogram structure through a pair of deformation beams of a pair of fixed beams, and the transmission of bending motion in a plane can be realized after the deformation beams are bent and deformed; and moreover, the rotation pair unit is set to be in a rectangular structure, the ratio of the width of the long beam to the thickness of the hinge body is not more than 0.5, so that the rotation pair unit has high torsional flexibility, large-range out-of-plane rotation can be realized through torsional deformation of the rotation pair unit, and the flexible hinge can perform compound motion of large-stroke rotation out of the plane and large-stroke movement in the plane under the matching of the rotation pair unit and the moving pair unit.

According to some embodiments of the invention, a ratio of a width of the long beam to a thickness of the hinge body is 0.3 to 0.5.

According to some embodiments of the invention, the ratio of the length of the long beam to the short beam is 2 to 5.

According to some embodiments of the invention, the long beam has a width smaller than a width of the short beam.

According to some embodiments of the present invention, a middle section of each of the long beams is fixedly connected to the hinge body, and both ends of each of the long beams are separated from the hinge body.

According to some embodiments of the invention, the deformation beam has a width equal to a width of the long beam, and the length of the deformation beam is greater than the length of the fixed beam.

According to some embodiments of the invention, a ratio of a length of the deformation beam to a length of the fixing beam ranges from [3, 4 ].

According to some embodiments of the invention, the mobile sub-unit has a rectangular cross-sectional shape.

According to some embodiments of the invention, the rotation sub units are parallel to each other on the hinge body.

According to a second aspect embodiment of the present invention, the compliant parallel mechanism includes a terminal platform and three sets of spatial large-stroke compliant hinges of the planar composite structure according to the first aspect embodiment of the present invention, the three sets of spatial large-stroke compliant hinges of the planar composite structure are distributed around the terminal platform and are respectively connected to the terminal platform, and adjacent spatial large-stroke compliant hinges of the planar composite structure are connected by a fixing structure.

According to the compliant parallel mechanism of the embodiment of the second aspect of the invention, the spatial large-stroke compliant hinge of the planar composite structure of the embodiment of the first aspect of the invention is configured, so that the translational motion of the compliant parallel mechanism in three spatial degrees of freedom is realized.

According to some embodiments of the invention, each of the planar composite-structure spatial large-stroke compliant hinges is equiangularly distributed about the terminal platform.

Drawings

The invention is further described below with reference to the accompanying drawings and examples;

FIG. 1 is a 45 degree angled top view of a compliant parallel mechanism according to an embodiment of the present invention;

FIG. 2 is an expanded plan view of a compliant parallel mechanism according to an embodiment of the present invention;

FIG. 3 is a first schematic diagram illustrating the operation of the compliant parallel mechanism according to the embodiment of the present invention;

FIG. 4 is a second schematic diagram illustrating the unfolding operation of the compliant parallel mechanism according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

The planar composite structure space large-stroke flexible hinge comprises a hinge body, a moving auxiliary unit 4 and a plurality of rotating auxiliary units 3, wherein the hinge body is a metal sheet, and the moving auxiliary unit 4 and each rotating auxiliary unit 3 are arranged on the hinge body.

Specifically, the moving pair unit 4 includes a pair of fixed beams and a pair of deformable beams, the fixed beams and the deformable beams are connected to form a parallelogram structure, the cross-sectional shape of each rotating pair unit 3 is rectangular, each rotating pair unit 3 includes a pair of long beams and a pair of short beams, and the ratio of the width of the long beams to the thickness of the hinge body is not more than 0.5.

The planar composite structure space large-stroke flexible hinge comprises a hinge body, a moving auxiliary unit 4 and a plurality of rotating auxiliary units 3, wherein the moving auxiliary unit 4 is fixed on the hinge body, the moving auxiliary unit 4 forms a parallelogram structure through a pair of deformation beams of a pair of fixed beams, and the transmission of bending motion in a plane can be realized after the deformation beams are bent and deformed; furthermore, the revolute pair unit 3 is set to be a rectangular structure, the ratio of the width of the long beam to the thickness of the hinge body is not more than 0.5, so that the revolute pair unit 3 has high torsional flexibility, large-range out-of-plane rotation can be realized through torsional deformation of the revolute pair unit, and the flexible hinge can perform composite motion of large-stroke rotation out of the plane and large-stroke movement in the plane under the matching of the revolute pair unit 3 and the moving pair unit 4. It should be noted that, the plane where the planar composite structure space large-stroke compliant hinge of the present embodiment is located is a reference plane of the overall mechanism, and the out-of-plane rotation refers to the rotation deformation of the end of the compliant hinge around a certain axis in the reference plane; in-plane large stroke movement refers to movement of the compliant hinge tips in a reference plane.

In some embodiments, the middle section of each long beam is fixedly connected to the hinge body, and two ends of each long beam are separated from the hinge body; with this arrangement, the middle section of one of the long beams of each revolute pair unit 3 is a fixed section, and both ends thereof are first torsion sections, respectively, and the middle section of the other long beam is a second torsion section, and both ends thereof are third torsion sections, respectively. More specifically, in order to reduce the torsional rigidity of the long beam to enable a large out-of-plane bending deformation, a large ratio between the long beam and the short beam is required, and the ratio of the length of the long beam to the length of the short beam in this embodiment is set to 3. Further, in the embodiment, the ratio of the width of the long beam to the thickness of the hinge body is 0.3-0.5, so that the torsional flexibility of the rotary pair unit 3 is better improved, and effective guarantee is provided for realizing out-of-plane large-range bending deformation.

Furthermore, in this embodiment, the width of the deformation beam is equal to the width of the long beam, and the length of the deformation beam is greater than the length of the fixed beam, and at the same time, the cross-sectional shape of the moving sub-unit 4 is rectangular, that is, the moving sub-unit 4 is in a rectangular structure, so that the deformation beam and the fixed beam are perpendicular to each other, and the transmission of the in-plane bending motion can be realized by the bending deformation of the deformation beam. It will be appreciated that the moving sub-unit 4 in this embodiment is a narrow rectangular structure, i.e., the aspect ratio between the deformation beam and the fixed beam is large, so that the bending rigidity of the deformation beam is reduced, facilitating it to achieve in-plane bending deformation, wherein the ratio of the lengths of the deformation beam to the fixed beam is specifically 3 or 4.

The moving sub-unit 4 and each of the rotating sub-units 3 of the present embodiment are each embedded in a metal sheet as a hinge body, and the moving sub-unit 4, each of the rotating sub-units 3, and the metal sheet are in the same plane before being deformed. More specifically, the respective rotary sub units 3 are parallel to each other on the hinge body, the moving sub unit 4 is connected to one of the rotary sub units 3, and the deformation beam of the moving sub unit 4 and the rotary sub unit 3 are perpendicular to each other.

Referring to fig. 1 to 4, the compliant parallel mechanism according to the second embodiment of the present invention includes a terminal platform 2 and three sets of spatial large-stroke compliant hinges of the planar composite structure according to the second embodiment of the present invention, the three sets of spatial large-stroke compliant hinges of the planar composite structure are distributed around the terminal platform 2 and are respectively connected to the terminal platform 2, and adjacent spatial large-stroke compliant hinges of the planar composite structure are connected to each other through a fixing structure 1.

According to the compliant parallel mechanism disclosed by the embodiment of the second aspect of the invention, the spatial large-stroke compliant hinge with the planar composite structure disclosed by the embodiment of the invention is configured, so that the translation motion of the spatial three-degree-of-freedom compliant hinge is realized.

More specifically, as shown in fig. 2, the fixed structure 1 is a sheet structure, and the spatial large-stroke compliant hinges of the planar composite structure are distributed around the end platform 2 at equal angles. It can be understood that, in order to improve the overall rigidity and stability of the compliant parallel mechanism, fixing blocks are respectively covered on the hinge body and the fixed structure 1 (i.e. non-deformation areas); in actual operation, the fixing block can be an acrylic block.

As shown in fig. 3, the compliant parallel mechanism of the embodiment of the present invention is similar to a common Delta mechanism and is a 3-RRRRP structure, and in the planar composite structure space large-stroke compliant hinge constituting the compliant hinge, the function of the moving pair unit is equivalent to that of a parallel four-bar mechanism of the common Delta mechanism, and the function realized after the two revolute pairs located at the rear end of the middle part and the two revolute pairs located at one side are matched is the same as that of a fisheye bearing of the common Delta mechanism; meanwhile, in the embodiment, the four revolute pair units positioned on two sides are coaxial revolute pairs, so that the stability of the whole structure is improved through redundant constraint.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.