According to the structure characteristics of the adjustable guide cutter for cleaning edge, the installation process of the guide plate was analyzed, and the fixed method of the guide plate was emphasized. The spring locking structure of the guide plate was simple, convenient for disassembly and assembly, but the spring elasticity must be in a reasonable range, because it was necessary to ensure that the disassembly and assembly was convenient, and the pressure was enough. In the analysis process, the mechanical model of the locking process was established, the formula for calculating the locking force of the guide plate was derived, and the basic conditions for ensuring the reliability of the locking were put forward. According to the spring material and structure size, the main parameters of the spring were selected, and the assistant force of the guide plate disassembly and the influence on the locking force of the guide plate were checked. The results show that the spring elasticity has little influence on the locking, and the rotation locking of the guide plate is closely related to the correct operation of operator.