Controllable wedge pre-tightening mechanism for micro platform of compliant mechanism

Abstract

The invention discloses a controllable wedge pre-tightening mechanism for the micro platform of a compliant mechanism. The controllable wedge pre-tightening mechanism comprises a microcalliper, a pedestal, a spring, a vertical moving wedge, a horizontal moving wedge, a piezoelectric ceramic and a platform. When the piezoelectric ceramic is mounted and dismantled, the process can be finished only by wringing the microcalliper, the regulation and the maintenance are convenient, and the pre-tightening is stable. Since the extent of pre-tightening can be accurately controlled in real time through the microcalliper, the blindness of pre-tightening is avoided. The height of a vertical moving wedge inclined face is lower than that of a horizontal moving wedge inclined face, thus the scope of pre-tightening is enlarged. The controllable wedge pre-tightening mechanism for the micro platform of the compliant mechanism is an independent module, and the processing of the platform is not affected.

Description

technical field [0001] The invention relates to the technical field of a micro-motion platform of a compliance mechanism, in particular to a controllable wedge pretensioning mechanism for a micro-motion platform of a compliance mechanism. Background technique [0002] Piezoelectric ceramics are often used as drivers for compliant mechanism micro-motion platforms. The installation of piezoelectric ceramics has a great influence on the performance of the platform. Using wedge preloading mechanism to preload piezoelectric ceramics can eliminate the gap between piezoelectric ceramics and the platform. . [0003] The existing wedge pre-tightening mechanism is blind during installation and cannot accurately control the degree of pre-tightening. Excessive pre-tightening will easily cause the platform to exceed the maximum stroke. In severe cases, it will cause buckling of the compliant hinge. The purpose of eliminating gaps. Utilizing the principle of frictional self-locking, the...

AI Technical Summary

Problems solved by technology

[0003] The existing wedge pre-tightening mechanism is blind during installation and cannot accurately control the degree of pre-tightening. Excessive pre-tightening will easily cause the platform to exceed the maximum stroke. In severe cases, it will cause buckling of the compliant hinge. The purpose of eliminating the gap

Using the principle of friction self-locking, the angle of the wedge slope must be greater than the self-locking angle so that the wedge mechanism can self-lock, but the pre-tightening range is small; and special tools are required for installation and disassembly, which is inconvenient to use

In addition, some wedge pre-tightening mechanisms process screw holes on the body of the platform, which affects the overall stress distribution of the platform

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