目的 解决KDF2， KDF3型滤棒成型机在线监测系统测径仪的初始结构总体尺寸过大， 不能安装在滤棒成型机有限空间内的问题。方法 将发明问题解决理论 （TRIZ） 及约束理论 （TOC） 的优点结合，并用于指引KDF2， KDF3型滤棒成型机在线监测系统测径仪的结构创新设计。结果 通过约束理论寻找到制约设计的关键矛盾， 并引导发明问题解决理论对矛盾进行消除， 最终形成可行的滤棒成型机测径仪结构创新设计方案， 引导完成产品设计。结论 合理结合该2种理论可以更快捷地得到创新设计方案。

The initial designed structure of the diameter measuring gauge of filter rod forming machine was too large, so that it could not be installed in the limited space of filter rod forming machine. The structure of the diameter measuring gauge was redesigned in order to overcome the space constraints of filter rod forming machine. Firstly, the redesigning of diameter measuring gauge of KDF2, KDF3 type filter rod forming machine was guided by combining the advantages of the theories of inventive problem solving (TRIZ) and constraints (TOC). Next, through constraints theory, the key contradictions of the initial design were found and the contradictions were eliminated using the inventive problem solving theory. Finally, a feasible innovation design scheme for diameter measuring gauge of filter rod forming machine was achieved, and the product design was successfully completed. In conclusion, reasonable combination of these two theories can obtain innovation design schemes more rapidly.