English 
Shield machine, its full name is shield tunnel boring machine, is a kind of special construction machinery for tunnel boring, which is widely used in subway, railway, highway, municipal, hydropower and other tunnels, underground comprehensive pipe gallery projects and other fields.
LYXQL started the development and research of slewing ring bearing for TBM in 2008, and in the year of 2009, the self developed main bearing is used in a large-scale composite earth pressure balance shield machine with a diameter of 7.26 meters, in 2015, the first main bearing of the shield machine exported to Russia
