大型医学影像设备SPECT机架结构设计与分析

Structural Design and Analysis for the Gantry of Large Medical Imaging Equipment SPECT

大型医学影像设备SPECT的主机架具有负载重和倾覆力矩大的特点。为保证设备的安全性,通常要求其承载能力达到1t以上。基于槽型钢结构设计了SPECT主机架的机械结构。在三维建模的基础上,应用有限元方法对机架的强度、刚度和稳定性进行了仿真分析。分析结果表明,机架性能指标满足设计要求,设计模型的最大变形量为0.873mm。用关节臂式三坐标测量机对实物样机进行测量,最大变形量为0.9mm。仿真分析结果与实测结果基本一致,验证了仿真模型的合理性。

The main gantry of the large medical imaging equipment--SPECT has the characteristics of load weight and overturning torque. To ensure the safety, its load capacity usually requires more than 1 ton. Based on the channel section steel, the main gantry mechanical structure of SPECT is designed. Based on three-dimensional modeling, applying finite element method makes the simulation analysis of frame strength, stiffness and stability. The results show that the performance index satisfies the design requirements of the gantry, and the maximum deformation amount of the design model is 0. 873 mm. With articulated arm three-dimensional measuring machine for measuring the physical prototype, the maximum deformation is 0.9 mm. Simulation results are in agreement with the experimental results, verifying the reasonableness of the simulation model.