目的 解决卷烟分拣作业中喷码系统安装在皮带输送机上方，易受条烟不规则、条烟颜色和环境光线的影响，从而导致漏喷码次数高等问题。方法 应用TRIZ理论对喷码系统进行创新设计，根据反向作用原理和物理/化学状态变化原理，将喷码系统安装在皮带输送机底板下方，并采用对颜色识别灵敏度更高的色标来检测光电传感器。结果 改进后，喷码系统的月均条烟漏喷码次数由305次减少到4.3次，提高了卷烟配送的分拣效率。结论 表明TRIZ理论确定的解题方向是可行的，可以有效解决卷烟喷码系统优化设计的工程技术问题。

The work aims to solve the problem that the inkjet system installed above the belt conveyor in the cigarette sorting operation was easily affected by the irregularity and color of cigarette and the ambient light, thus resulting in such problems as a large number of missing sprayed codes. TRIZ theory was applied in the innovation design of inkjet system. According to the reaction principle and the physical/chemical state change principle, the inkjet system was installed at the bottom of the belt conveyor floor, and the color code with higher color recognition sensitivity was used to detect the photoelectric sensor. The number of average missing sprayed codes of cigarettes of the improved inkjet system in each month was reduced from 305 to 4.3, which improved the sorting efficiency of cigarette distribution. It shows that the direction of problem solving determined by the TRIZ theory is feasible, which can effectively solve the engineering problems in optimal design of cigarette inkjet system.