| The automatic sample transportation and testing system have been widelyapplied in the modern analytical testing equipment. Meantime, designing and researchof this system have become a hotspot in the field of instrument research. Based onresearch for variety of automatic sample transportation and testing system applied indifferent analysis testing platform, a new system designing is introduced in this paper.(1) The overall design scheme of the system is introduced in this paper. Thesampling action in this design base on the application of the96-well plate. This is howthe system work. First the sample for testing was fixed to the96-well plate. Then theplate will be transported to the test location by the straight line action agent, whichaim to complete the test action of multiple samples. According to the Lambert BeerLaw, the detection scheme is established. The testing of sample is finished throwoptical density testing. According to the sampling and testing mechanism of thesystem, the whole system is designed with adoption of the modular method. Thewhole system is divided into several module including the body shell module, powermodule, display and output module, sample transportation module testing module andcontrol module. The design of each module of the system is based on the overalldesign scheme and the function of each module. The most design task of the bodyshell module is its structure and shape outside. Then the hardware used in the powermodule and output module are chosen for the system. Meantime, the calculation anddesign of the sample module’s transmission system are completed, which include theselection of the driving step motor and the overall scheme design of the samplemodule’s structure. Then the hardware of testing module are chosen based on theoptical path system’s scheme, which make sure the structure of the testing module’severy part established. The control module of this system come out with a structure ofupper and lower machine. The industrial computer is used as the upper machine andthe ARM microcontroller is chosen for the lower subsystem. The control system isdriven by the STM32F106VET6series single-chip microcomputer. The PWMcontroller AMM56219is used in the driving of the sample module’s step motor. And the ULN2803chip is chosen for driving the testing module’s step motor. At the sametime, the other part of the control module including the signal collection andsimplification circuit of the testing module are designed. Then the program structureis established base on the system’s hardware circuit and controlling scheme.(2) After completing the system’s overall structure and control scheme, thesystem’s structure virtual digital3-D model is established with the UG NX software.Then the simulation of assembly and analysis are carried out. The finite elementmethod is introduced into the analysis of the system’s structure. Then the static andmodal analysis are carried out to verify the structure’s reliability and stability of thesystem.(3) The system’s prototype is made out on the basis of the simulation verification.The processing and assembly of various modules’ structure are carried out. Meantime,the circuit and program of control system are integrated into the system. Then thewhole system’s online debugging is carried out to validate the system scheme’sfeasibility. Finally a series standard sample are tested by the prototype to verify itsfunction. The testing result’s accuracy,stability and repeatability meet the designindicators. Above all, the whole system could complete the design features and run ingood condition. |
PDF Full Text Request