A Zero Poisson's Ratio Multistable Stretchable Arm Based on Shape Memory Polymers

A memory polymer and multi-stable technology, applied in the direction of claw arm, program control manipulator, chuck, etc., can solve the problems of limited elastic deformation capacity, heavy weight of itself, and inability to expand and contract in the axial direction of the manipulator, so as to achieve deformation capacity Strong, lightweight effect

Active Publication Date: 2022-02-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional extension arm is generally a mechanical arm made of rigid material, and the rigid material is not only bulky and heavy, but also has limited elastic deformation capacity. work under

Method used

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  • A Zero Poisson's Ratio Multistable Stretchable Arm Based on Shape Memory Polymers
  • A Zero Poisson's Ratio Multistable Stretchable Arm Based on Shape Memory Polymers
  • A Zero Poisson's Ratio Multistable Stretchable Arm Based on Shape Memory Polymers

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specific Embodiment approach 1

[0023] Specific implementation mode one: as Figure 1 to Figure 10 As shown, the present invention discloses a zero Poisson's ratio multi-stable extension arm based on a shape memory polymer, including a multi-stable arm 11 and a multi-stable gripper 12, and the multi-stable arm 11 includes several Composite negative stiffness unit cell 1, the composite negative stiffness unit cell 1 includes a curved beam structure 1-1 and three supporting structures 1-2, the curved beam structure 1-1 adopts a shape memory polymer containing reinforced fibers , the support structure 1-2 is made of nylon, and the three support structures 1-2 are vertically fixed to the middle and both ends of the curved beam structure 1-1 respectively, and the two support structures 1-2 at the two ends are located on the same side and connected to the curved beam structure 1-1. The support structure 1-2 located in the middle is arranged facing each other, two rigid blocks 1-3 are arranged symmetrically on both...

specific Embodiment approach 2

[0024] Specific implementation mode two: as figure 1 , 5 , 9, and 10, this embodiment is a further description of specific embodiment 1. The composite negative stiffness unit cells 1 are in the unfolded state and are higher than the glass of the material of the curved beam structure 1-1. Under the condition of changing transition temperature, it is compressed under the drive of external load to produce bending deformation for shaping. After the shape is shaped, it is naturally cooled and fixed to form the multi-stable support arm 11. When all the curved beams of the multi-stable support arm 11 Structure 1-1 heats up to the same temperature at the same time, and all the curved beam structures 1-1 return to the unfolded state to release the prestress to make the multistable support arm 11 stretch in a straight line. When the curved beam structure 1- on the outside of the multistable support arm 11 is bent 1 The heating time is longer than that of the curved beam structure 1-1 o...

specific Embodiment approach 3

[0025] Specific implementation mode three: as figure 1 As shown, this embodiment is a further description of the second embodiment. The two sides of the curved beam structure 1-1 use polyimide adhesive to paste the electric heating sheet on the initially expanded state containing reinforcing fibers. The inner surface of the shape-memory polymer is controlled by a temperature controller to control the temperature of the electric heating sheet, thereby changing the temperature of the curved beam structure 1-1.

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Abstract

A zero Poisson's ratio multi-stable stretch arm based on a shape memory polymer relates to a stretch arm structure. The composite negative stiffness unit cell includes a curved beam structure and three supporting structures. Two rigid blocks are arranged symmetrically on both sides of the curved beam structure to change the cross-sectional size. Every four composite negative stiffness unit cells are combined to form a composite negative stiffness Honeycomb structure, each of the two opposite composite negative stiffness unit cells is fixed with a spring in the middle of the curved beam structure, and every eight composite negative stiffness honeycomb structures form a support arm unit, and multiple support arm units are fixed to form a multi-stable support. Arm, the multi-stable gripper and one end of the multi-stable arm are fixedly connected by adhesive, and the fingers have the same structure as the multi-stable arm and shrink, and can be stretched or bent through temperature control. It has a shape memory function, can be stretched or bent through temperature control, has zero Poisson's ratio effect, light weight, strong deformation ability, and is more suitable for operations in narrow space conditions.

Description

technical field [0001] The invention relates to an extension arm structure, in particular to a zero Poisson's ratio multi-stable extension arm based on a shape memory polymer. Background technique [0002] Traditional extension arms are generally mechanical arms made of rigid materials. Rigid materials are not only bulky and heavy, but also have limited elastic deformation capacity. The axial direction of the mechanical arm cannot be stretched and retracted. Start the work below. [0003] Negative stiffness porous structure is a new type of lightweight multifunctional structure that has attracted widespread attention at home and abroad in recent years. Due to its properties or functions such as negative stiffness effect, multi-stable effect, and repeatable characteristics, it has the advantages of impact energy absorption and shape transformation. Metamaterials, deployable structures and other fields have broad application prospects. Negative stiffness structure is a mecha...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B25J9/00B25J15/00B25J18/02
CPCB25J9/0012B25J9/0015B25J18/02B25J15/0009
Inventor王长国谭惠丰张季陶强夏振猛
OwnerHARBIN INST OF TECH