A two-dimensional constant force micro positioning platform based on compliant mechanism

Abstract

The invention discloses a two-dimensional constant force positioning platform, for providing a constant force output in a specified direction in a two-dimensional plane, comprising a force input end,a force output end, a guide mechanism, a decoupling mechanism, a constant force mechanism, and a base. The guide mechanism and the decoupling mechanism respectively comprise a first guide mechanism and a first decoupling mechanism symmetrically distributed in the x direction with respect to the y direction and a second guide mechanism and a second decoupling mechanism symmetrically distributed inthe y direction with respect to the x direction. The force input end and the force output end are respectively arranged at the two ends of the first decoupling mechanism and the second decoupling mechanism, and the decoupling mechanism is respectively connected to the base through a bistable beam capable of generating negative stiffness and a composite straight beam capable of generating positivestiffness. A quasi-zero stiffness system is composed of the bistable beam and the composite straight beam in parallel. By adopting the two-dimensional constant force positioning platform of the invention, the constant force output and the two-degree-of-freedom motion are realized, and the decoupling performance is good, the positioning accuracy is high, and the structure is simple.

Description

technical field [0001] The invention relates to a two-dimensional constant force platform based on a compliant mechanism, which belongs to the field of precision micro-operation, and is mainly used in ultra-precision machining, precision engineering, micro-electromechanical systems (MEMS), microelectronic engineering, bioengineering (cell injection), etc. Cutting-edge science and technology fields. Background technique [0002] The micro-positioning platform technology based on the compliant mechanism uses flexible hinges instead of traditional rigid connection parts to realize the movement and positioning of parts. It has the advantages of no friction and wear, small impact, compact structure, easy processing, assembly-free and strong compatibility. It is widely used in precision operation and positioning system. [0003] The Changli micro-positioning platform is a new device in recent years. The Changli micro-positioning platform uses the design of the overall stiffness o...

AI Technical Summary

Problems solved by technology

Since micro-positioning platforms are mostly used in ultra-precision machining and assembly, the objects carried by them have the characteristics of small size and compact structure, and their ability to resist impact loads is poor. The force is changing, so the carried target will be subject to a certain impact force, which will have a certain impact on its accuracy

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