CN105673679A

CN105673679A - Compression-resistant inner Lamina Emergent Torsion (LET) flexible hinge

Info

Publication number: CN105673679A
Application number: CN201610056400.3A
Authority: CN
Inventors: 刘凯; 曹毅; 周睿; 葛姝翌; 丁锐
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2016-01-26
Filing date: 2016-01-26
Publication date: 2016-06-15

Abstract

The invention provides a compression-resistant inner Lamina Emergent Torsion (LET) flexible hinge. According to the compression-resistant inner LET flexible hinge, the problems that an inner LET flexible hinge cannot bear an axial compression load and is low in compressive strength can be solved. The compression-resistant inner LET flexible hinge comprises an upper bent section, middle bent sections, a left bent section, a right bent section, a lower bent section, upper torsional sections and a lower torsional section. The middle bent sections, the two ends of the left bent section and the two ends of the right bent section are connected through the upper torsional sections, the lower torsional section, the upper bent section and the lower bent section to form a whole of which a T shape and a U shape are combined. The compression-resistant inner LET flexible hinge is characterized in that the upper torsional sections, the lower torsional section, the middle bent sections and the right bent section are combined to form an S-shaped structure.

Description

LET flexible hinge in resistance to compression

Art

The present invention relates to LEMs flexible hinge structure field, be specially LET flexible hinge in a kind of resistance to compression.

Background technology

LEMs (LaminaEmergentMechanisms) is machined by light sheet material, and can realize the novel compliant mechanism of a class [6] of motion outside plane. Except possessing other compliant mechanism advantage, LEMs also has unique advantage, and as simple in processing technique, economical, its flatness of the response also can reduce storage, assembly space.

At present, Chinese scholars focuses primarily upon the design of kinematic pair for the research of LEMs. Jacobsen et al. devises intraarticular LET (LaminaEmergentTorsion) the most commonly used in current LEMs and outer LET, such joint is a kind of compliant members being similar to hinge, it is different from hinge and obtains motion by rotating the surface moved relative to each other, submissive joint obtains desirable movement by the deformation of material, it is characterized in simple in construction, manufacturing process is also uncomplicated, have bigger slewing area simultaneously, equivalent stiffness is less, and meet the flatness of the response of LEMs, therefore, no matter at microcosmic or macroscopic arts, LET all has a wide range of application scenarios. for interior LET flexible hinge therein structure as shown in Figure 1, it includes soft segment 1, soft segment 2 and soft segment 3, soft segment 4, wherein connecting into " work " font respectively through soft segment 2,4 between soft segment 1 and soft segment 3 overall, there is the problem that comprcssive strength is low in it.

Summary of the invention

The invention provides LET flexible hinge in a kind of resistance to compression. It can solve interior LET flexible hinge cannot bear axial compression load, the problem that comprcssive strength is low.

LET flexible hinge in a kind of resistance to compression, about symmetrical, it includes bent segments, middle bent segments, left bent segments, right bent segments, lower bent segments and upper torsion fragment, lower torsion fragment, the two ends of described middle bent segments and left and right bent segments connect into the composite entity of " T " font and concave respectively through upper torsion fragment, lower torsion fragment and upper bent segments, lower bent segments, it is characterised in that: described upper and lower torsion fragment and be combined into S type structure between middle bent segments, right bent segments.

It is further characterized by

Described left bent segments, right bent segments, lower bent segments and upper and lower torsion fragment, middle bent segments join end to end and are being internally formed concave hollow slots.

Compared with the structure of interior LET flexible hinge, the beneficial effects of the present invention is: owing to the extensional rigidity of each fragment is much larger than compressional stiffness, it is combined into S type structure between upper and lower torsion fragment and middle bent segments, right bent segments, make hinge be stressed effect time, the middle bent segments that rigidity is less bears pulling force effect, greatly reduce the hunt effect of hinge, thus substantially increasing the axial compression resistance ability of flexible hinge.

Accompanying drawing explanation

Fig. 1 is LET flexible hinge structure schematic diagram in tradition;

Fig. 2 is LET flexible hinge structure schematic diagram in resistance to compression.

Detailed description of the invention

See Fig. 2, LET flexible hinge in a kind of resistance to compression provided by the invention, it include bent segments A, middle bent segments B, E-1, E-2, F-1, F-2, left bent segments D-2, right bent segments D-1, lower bent segments A and upper torsion fragment C-1, C-2, lower torsion fragment G, middle bent segments B, E-1, E-2, F-1, F-2 and left and right bent segments D-1, D-2 two ends connect into the composite entity of " T " font and concave respectively through upper torsion fragment C-1, C-2, lower torsion fragment G and upper bent segments A, lower bent segments A. It addition, be combined into S type structure between upper and lower torsion fragment C-1, G and middle bent segments B, E-1, F-1, right bent segments D-1.

Left bent segments D-2, right bent segments D-1, lower bent segments H and upper and lower torsion fragment C-1, C-2, G, middle bent segments join end to end and are being internally formed concave hollow slots.

It is demonstrated experimentally that the axial compression load that in the resistance to compression of the present invention, LET flexible hinge can bear and traditional interior LET flexible hinge are compared and can be improved about 27.11 times.

Claims

1. a LET flexible hinge in resistance to compression, about symmetrical, it includes bent segments, middle bent segments, left bent segments, right bent segments, lower bent segments and upper torsion fragment, lower torsion fragment. The two ends of described middle bent segments and left and right bent segments connect into the composite entity of " T " font and concave respectively through upper torsion fragment, lower torsion fragment and upper bent segments, lower bent segments, it is characterised in that: described upper and lower torsion fragment and be combined into S type structure between middle bent segments, right bent segments.

2. LET flexible hinge in a kind of resistance to compression according to claim 1, it is characterised in that: described left bent segments, right bent segments, lower bent segments and upper and lower torsion fragment, middle bent segments join end to end and are being internally formed concave hollow slots.