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- 2015
压电驱动撞针式高黏性胶体微喷系统的研制
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Abstract:
针对高黏性胶体材料要求快速、精确、灵活分配的需求,以及气压驱动撞针式喷射技术分配效率低、液滴操控能力有限的问题,设计了一种压电驱动撞针式高黏性微喷系统。该系统将压电致动器与传统撞针式喷射阀相结合,并利用菱形放大机构对压电致动器位移进行放大后带动撞针振动,以此对微量高黏性胶体的高速、精确分配进行操作。采用有限元法对菱形放大机构进行静、动态特性分析,通过构建位移输出单元的动力学模型分析撞针位移输出情况,确定了机械本体的结构参数,搭建了包含阀体、气路、驱动和监测单元的微喷系统实验平台,开发了基于模糊PID控制的胶体预分配方案。实验结果表明:撞针振幅能够达到有利于喷射的0.5 mm范围,胶滴体积随喷射频率和胶体黏度的增大而减小,分配重复精度和准确度分别可控制在4％和±6％以内,进一步揭示了高黏性胶体材料的非接触式分配机理,验证了压电驱动撞针式喷射方案的可行性。
A kind of needle？？type micro jet dispensing systems driven by piezoelectric actuator for high viscous liquids is proposed to dispense high viscous materials speedily, accurately and flexibly, and to solve the problem that needle？？type jet dispensing technology driven by pressure has low efficiency and limited ability to control droplets. The system combines the piezoelectric actuator and the traditional needle？？type jet valve, and utilizes a diamond displacement amplification mechanism to magnify the displacement of the piezoelectric actuator and to vibrate the needle so that the droplets are driven to squirt from the nozzle. The finite element analysis method is used to analyze the structure and the dynamic performance of the amplification mechanism. The output displacement of the needle is analyzed by building a dynamic mathematical model of the displacement output module. The structural parameters of the mechanical structure are obtained through these analyses. An experimental platform consisting of jet valve, pneumatic module, driving module and monitoring module is built, and a pre？？distribution scheme based on fuzzy PID is developed. Experimental results show that the needle amplitude reaches 0.5 mm which is very suitable for dispensing. Smaller droplets are obtained as jet frequency and fluid viscosity increase, and the dispensing repeat？？precision and accuracy of the droplets can be controlled below 4% and within ±6%, respectively. These results reveal the non？？contact dispensing mechanism of high viscous materials, and verify the feasibility of the needle？？type jet dispensing system driven by piezoelectric actuator
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