永磁辊式涡流分选机是提取火灾现场金属熔落物的重要装置，但是现有分选设备存在分选效率低，体积、质量大等问题，需要对其进行优化。对分选机核心构件磁辊的磁系空间进行了研究。首先，建立涡流分选机磁系空间结构模型，并说明了永磁辊式涡流分选机的工作原理，在磁辊给定时，给出了其磁辊磁块磁系空间的计算方程；然后，结合有限元方法分析了原磁系空间的磁感应强度分布规律，并比较不同外径、不同内径、不同铁环厚度下磁辊磁感应强度的变化规律；最后，提出一种对原涡流分选机的优化设计方案，减轻了分选机的质量，提高了分选机的效率。

Permanent magnet roller eddy current sorter is an important device for extracting metal slag at the fire site, but the existing sorting equipment has problems such as low sorting efficiency and large volume and weight, and it needs to be optimized. The magnetic system space of the core components of the sorter is studied. The magnetic system space structure model of the sorter is established. The working principle of the sorter is explained, and the calculation equation of the magnetic system space of the magnetic block for a certain magnetic roller is given. Then, the law of the magnetic induction intensity distribution of the original magnetic system space is analyzed by using the finite element method, and the magnetic induction intensities of the magnetic roller under different outer diameters, different inner diameters, and different iron ring thicknesses are compared. An optimization design scheme for the original eddy current sorter is proposed, which reduces the weight and improves the efficiency of the sorter.