一种对中定位机构的设计及其优化分析

A Design and Optimization Analysis of the Centered Positioning Mechanism

显示器定位夹具是显示器装配生产线上的关键设备,对实现显示器自动化装配起到了重要作用。文中针对显示器定位夹具设计了一种关于曲柄滑块式的对中定位机构。为了提高夹具的定位精度和通用性,采用惩罚函数法对曲柄滑块机构优化求解,运用MATLAB对其仿真,并通过有限元方法对关键部件进行优化。研究表明,滑块在对零部件的夹紧定位过程中具有一定的行程,且受到曲柄、连杆的长度和最小传动角的影响。当曲柄和连杆的长度分别为300 mm和500 mm时,机构的通用性能达到最佳。最后通过有限元方法对关键零件优化分析,得到了最优结果,对中定位机构的定位精度达到了0.38 mm。

Display positioning fixture is the key equipment on the display assembly line,which plays an important role in realizing the automatic assembly of display.In this paper,a pair of centering positioning mechanisms for the crank slider is designed for the display positioning fixture.In order to improve the positioning accuracy and versatility of the fixture,the crank slider mechanism is optimized by the penalty function method,MATLAB is used to simulate it,and the key components are optimized by finite element method.The results show that the slider has a certain stroke in the process of clamping and positioning the components,and is affected by the length of the crank,the length of the connecting rod and the minimum transmission angle.When the length of the crank and the length of the connecting rod are 300 mm and 500 mm,respectively,the general performance of the mechanism is the best.Finally,the key components are optimized and analyzed by the finite element method,and the optimal results are obtained,so that the positioning accuracy of the centering positioning mechanism reaches 0.38 mm.