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Tunnel boring machine is widely used in underground engineering construction. During the construction process, the cutter frequently detects and replaces the construction efficiency and harms the safety of the cutter changer. It is imperative to realize the cutter change "Machine replacement manual". Traditional cutter fasteners are numerous and discrete, and their shapes and sizes are different. To design an automatic cutter changer for this structure, the actuator design will be very difficult. Designing an integrated cuttering system that is easy for machine operation is essential for “machine replacement manual”. In view of the above problems, this paper proposes an integrated cutter system scheme with three different structures according to the idea of integrating cutter, locking block and bolt. 7 performance indicators for integrated cutter evaluation for machine cutter change operation: static stiffness, static strength, weight, three-dimensional size, extraction size, disassembly action and pre-tightening force. Contrasting and analyzing the three integrated structural schemes and the various indicators of the traditional cuttering scheme, and obtaining an optimal cuttering scheme for machine cutter change. Introduction The tunnel boring machine is a complex large-scale machine for tunneling excavation, drainage and lining functions. It is the key equipment for mechanization of tunnel construction work [1] . The cutter mounted on the cutter head is the main cutter for the full-face tunneling machine to break the rock. The existing cutter change relies on the manual operation mode. In the construction environment of large depth and high water pressure, the manual cutter change is undoubtedly a safety hazard [2] . It is imperative to realize an efficient and safe working mode of “machine replacement manual” for cutter change operations. Since the traditional cutter fasteners are numerous and discrete, if the automatic cutter change actuator is designed directly for this structure, the design of the cutter change action will be very cumbersome, and the design of actuator will be very difficult, so before designing the cutter change robot, design an integrated cuttering system for machine operation is essential. There are few research results on the design of the integrated tool system. Only the French NFM company has launched relevant research abroad [3] . The Liyang Xie’s team of Northeastern University of China developed a rotary cutter system [4] . In general, there is little research on the development of integrated cutters. This research has important engineering significance. Three New Integrated Knife Base Structures Due to the multi-split structure of the conventional cutter, the cutter changing process is complicated, and the design of the cutter changer is complicated. The multi-split structure is improved into an integrated structure, which integrates bolts, wedge blocks and cutters of a conventional cutter system. Based on this idea, three different cutter system design schemes are proposed.

Design of Integrated Cutter System for Machine Cutter Change of Tunnel Boring Machine