Shulou(Shulou.com)11/24 Report--

CTOnews.com, December 15, according to the website of the Institute of Metal Research of the Chinese Academy of Sciences, Li Dianzhong, a researcher of the Institute of Metals, and a team of academicians led by Li Yiyi, have recently successfully developed a super-large shield machine with a diameter of 8 meters.

Self-developed 8-meter diameter main bearing for super-large shield machine | Picture Source: the main bearing weighs 41 tons and is the first shield machine main bearing made in China with the largest diameter and single weight. The main bearing will be installed on a super-large shield machine with a diameter of 16 meters and will be used for tunnel excavation. The successful development of the main bearing indicates that our country has mastered the integrated technology of independent design, material preparation, precision machining, installation, debugging, inspection and evaluation of the main bearing of shield machine.

CTOnews.com learned that the main bearing is the core component of the cutter head drive system of the shield machine. In the shield machine tunneling process, the main bearing "hand-held" cutter head rotates to cut the palm face and provides rotary support for the cutter head. The maximum axial force, radial force and overturning torque of the main bearing with a diameter of 8 meters are 105 KN, 104 KN and 105 KN respectively.

According to the Institute of Metal Research of the Chinese Academy of Sciences, the main reason why China's shield machine has been manufacturing super-large diameter main bearings for a long time is that the materials for manufacturing bearings and the machining accuracy of large rollers do not pass, and the whole process technology chain is not connected. The key research team and enterprises gathered wisdom to tackle key problems and developed first-class rollers with a diameter of more than 100 mm, which made China's bearing industry break through the first-class precision machining technology of large rollers.

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