Full-section tunneling machine for changing connecting radius between cutter head and rotary support

The invention in particular relates to a full-section tunneling machine for changing connecting radius between a cutter head and a rotary support, which belongs to the technical field of full-section tunneling machines. The center circle radius r of a main propelling roller contact raceway of the cutter head rotary support of the traditional full-section tunneling machine is adjusted to 0.5-0.7 R, wherein R is the diameter of the cutter head. Through the adoption of the design scheme, the rigidity of the cutter head of the full-section tunneling machine in the operation process is enhanced, the vibration of the cutter head during working is reduced and the operation efficiency of the tunneling machine is increased.