基于3D打印机控制结构的自动进样器系统设计

Design of Automatic Sampler System Based on 3D Printer Control Structure

摘要:

自动进样器现已大量应用于分析用仪器设备中;为了实现更快速、高效、智能化的进样,在传统进样器基础上设计了一种基于3D打印机控制技术的液相自动进样器控制系统;设计将三轴联动技术应用于进样器瓶号定位,电机加减速的S形曲线优化方案确保针架起停的稳定性和定位的精度;触摸屏的添加,可将进样器单独使用,增强了人机交互能力,同时还支持485联机通讯离子色谱仪等专用分析仪器,操作的详细提示也可杜绝用户误操作;驱动电路方面采用双极型电机专用控制芯片DRV8825,改进系统的整体结构与组成,优化主控与驱动电路的控制设计;进样器具有结构简单,操作方便,应用面广,自动化和智能化程度高,制造与维护成本低等优点;实际应用测试表明,该系统拥有良好的稳定性,系统整体性能大大提高,满足了设计需求,达到了设计要求。

Abstract:

Automatic samplers are now widely used in analytical instruments and equipments. In order to achieve more faster, efficient and intelligent injection, a liquid-phase automatic sampler system designed based on the traditional sampler and 3D printer control technology. Three-axis linkage technology used to position the sampler bottles. The optimization solution of acceleration and deceleration can ensure the stability of needle in the motor starting or stopping process and the positional accuracy. The using of touch screen can make the sampler used alone. It can enhance the capacity of human-computer interaction and can also support the 485 communication with ion chromatography equipments or other special analytical equipments. The operation prompt can prevent the user operation errors. The system used the dedicate control chip DRV8825 designing for bipolar motor as drive circuit. It can improve the overall structure and composition, optimize the control of the master and drive circuit. The sampler has the advantages of simple structure, convenient operation, wide application, high degree of automation and intelligence, low cost of the manufacturing and maintenance. The practical application tests show that the system has good stability. The overall system performance improved greatly, and reached the design requirement.