The Study For Key Technologies Of The Automatic Sampling In Blood Type Analysis System

With the development of medical technology, medical institutions need to dealwith more sample of blood type test. And that also increased the Lab Workers’ workload.The traditional manual and semi-automatic methods of blood type experiment not onlyare complicated, less efficient and less accurate, but also are more prone to humanerrors, so unable to meet the medical test needs of medical institutions; and people havebeen paying more and more attention to the medical test of blood type. Auto-samplingsystem is an important part of the automatic blood group experiments platform based onbioelectrical impedance technic; the study on auto-sampling system with high-precisionpositioning and high-precision sampling has great significance.To meet the high-precision positioning, high-security and high-precision samplingneed of the automatic blood group experiments platform, studied and developed theauto-sampling system’s design scheme, based on the research of imported blood typeanalyzer. According to the scheme, completed the mechanical structure design, motioncontrol design and embedded control system design. Through the finite element analysisof the critical mechanical parts, validate and optimize the design scheme. For designverification and optimization, make a motion and control co-simulation of the roboticarm finally.Detailed contents of this paper is as follows:①According to the sampling systemfunctional requirements, developed the design scheme of the auto-sampling systembased on research and analysis, analyzed the auto-sampling system’s compositionprinciple and working principle detailedly, developed the overall indicators ofauto-sampling system.②Completed the mechanical structure of the automaticsampling system, including the robotic arm, the sample-reagent plate, sample injector,used UG NX7.5to establish the3-D solid model of auto-sampling system. Because ofthe robotic arm’s structural characteristics, made static analysis and modal analysis tovalidate the design.③According to system’s similar positioning control needs,developed the design scheme of motion control, completed the detailed design based onmotion control chip LM629N and driver IC L298.④Due to the system’s complextiming and high real-time requirements, chose the optimal control system solutionbetween two control solutions from the system’s reliability, stability, upgrading,maintaining and extending, completed embedded control system design based on S3C2440A μC/OS-Ⅱ, including Operating System transplantation, the design oftasks’ programming and interrupt handling, and gave a part of the transplant code, thefunction prototype and flow block diagram of task.⑤In order to improve the roboticarm’s performance, make the motion and control co-simulation using ADAMS&MATLAB/Simulink. Results reached the desired control requirements, provided a goodreference for the design and optimization of control parameters and control procedures.