Wedge preloading mechanism and preloading method of a stacked piezoelectric ceramic driver

Abstract

The invention discloses a wedge pre-tightening mechanism of a stacked piezoelectric ceramic driver, which comprises a platform, a stacked piezoelectric ceramic driver, a base, a driven wedge, a thread adjustment rod, a driving wedge and a push-pull block. There is a groove on the platform, the base has a receiving groove, the receiving groove has an opening on the side wall of the base, the driven wedge is slidably connected in the opening, the top of the receiving groove has a threaded through hole, and the thread adjustment part is screwed into the threaded through hole Among them, the driving wedge is provided with a through groove, the push-pull block is arranged in the through groove, the connecting part of the threaded adjustment rod is connected with the push-pull block, the driven wedge and the driving wedge are respectively provided with slopes, and the two slopes are in contact. The invention also discloses a method for pre-tightening using the wedge pre-tightening mechanism. The active wedge is driven by rotating the threaded adjustment rod, and then the driven wedge that is in contact with it is pushed to achieve the preload of the stacked piezoelectric ceramic driver. The adjustment and maintenance are simple, the preload is stable, and the controllable two-way continuous Easy to adjust, install and disassemble.

Description

technical field [0001] The invention relates to a pre-tightening mechanism, in particular to a wedge pre-tightening mechanism of a stacked piezoelectric ceramic driver and a pre-tightening method thereof. Background technique [0002] Stacked piezoelectric ceramic actuators are often used in precision positioning and precision operating systems. The installation of piezoelectric ceramics has a great impact on the performance of the platform. Using a wedge preload mechanism to preload the stacked piezoelectric ceramic actuators can Eliminates the gap between the piezo actuator and stage. However, excessive pre-tightening will easily cause the platform to exceed the maximum stroke, and serious damage will cause damage to some weak parts of the precision positioning platform. Insufficient pre-tightening will not be able to eliminate the gap. The following problems exist in the existing wedge pre-tightening mechanisms: 1. Some cannot continuously adjust the pre-tightening degre...

AI Technical Summary

Problems solved by technology

However, excessive pre-tightening will easily cause the platform to exceed the maximum stroke, and serious damage will cause damage to some weak parts of the precision positioning platform. Insufficient pre-tightening will not be able to eliminate the gap

The following problems exist in the existing wedge pre-tightening mechanisms: 1. Some cannot continuously adjust the pre-tightening degree; The tightening mechanism needs to process screw holes on the platform, which affects the overall stress distribution of the platform

[0003] Publication number: CN102954323A invention patent discloses a controllable wedge preload mechanism for the micro-motion platform of the compliant mechanism, which has the following disadvantages: 1. It can only increase the preload continuously. It can only realize self-locking release, but cannot continuously reduce the preload. Therefore, the whole wedge preload mechanism must be removed from the platform and reset, and then re-increased to the required preload. Therefore, it can only be adjusted in one direction. Inconvenient; 2. Use a micrometer to control the adjustment of the preload, but the price of the micrometer is more expensive; 3. The wedge preload mechanism uses a tension spring as the reset device for the active wedge. This design is not compact and is limited by the space in the base. Cavity restrictions are difficult to fabricate and install

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