Recently，7 independently developed by China Railway Construction Heavy Industry Co., Ltd..The 6-meter main bearing rolled off the production line in the second industrial park of Changsha，Another Breakthrough in Key Technology of Super Large Diameter Main Bearing。Before，Railway Construction Heavy Industry has realized the independent development and batch application of small and medium diameter main bearings with a diameter of 5 meters or less.，On this basis，The R & D team has continuously broken through the key technology of super-large diameter main bearing.，Have successively developed a diameter of 6 meters、7.6 m main bearing，It fills in the blank of the type spectrum of the domestic super-large diameter main bearing of shield machine.，It has realized the complete independent development of main bearings from small and medium diameter to super large diameter.，It provides domestic shield machines with a diameter of 16 meters or less.“ Heart ”。

Key components of shield machine——Main bearing

Independently developed by China Railway Construction Heavy Industry Co., Ltd. Diameter 7.6 m main bearing

Main bearing is the key component of roadheader.，It bears the complex and harsh load transmitted by the cutterhead drive system.，Controlling the safe and reliable operation of the roadheader、Long life and stable operation“The gate of life”。A long time，Main bearing products and their key technologies are monopolized by foreign countries.，Especially, the technology of super-large diameter main bearing has not been completely broken through.，The core problems need to be solved urgently。

In order to win the key core technology battle of super-large diameter main bearing，In the Ministry of Science and Technology、Science and Technology Department of Hunan Province、Department of Industry and Information Technology of Hunan Province、With the support of Changsha Science and Technology Bureau and China Railway Construction Corporation，Relying on the National Science and Technology Plan Project、Ten key technical projects in Hunan Province、Key products of manufacturing industry in Hunan Province“Uncover the list and take command”Project、Major science and technology projects in Changsha and major science and technology projects in China Railway Construction Corporation，Railway Construction Heavy Industry Co., Ltd“Four aspects”Leading the Breakthrough of Innovative Technology，Independent design theory of super large diameter main bearing、Precision manufacturing process、Core and difficult technologies such as working condition simulation test，Successfully developed a diameter of 6 meters、7.6m and other super-large diameter main bearings。

Independently developed by China Railway Construction Heavy Industry Co., Ltd. with a diameter of 3 meters、6 m main bearing

During the development of domestic large diameter main bearings，China Railway Construction Heavy Industry Co., Ltd.、Continuous innovation，Finally, the key technology of super-large diameter main bearing is broken through.，It has promoted the rapid development of roadheader industry.，In order to solve the core components of roadheader“Stuck in the neck”Difficult problems provide firm confidence and strong guarantee.。