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2025-01-18 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > IT Information >
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Shulou(Shulou.com)11/24 Report--
Thanks to CTOnews.com netizen Captain Buck for the clue delivery! CTOnews.com June 10 news, the shield machine is known as "the king of construction machinery in the world", and the super-large diameter shield machine is even more known as "the king of kings". At present, China has been in the forefront of the world in this field.
In this field, China has achieved a very high ability of independent control. For example, the localization rate of a large number of shield machines, such as the first synchronous tunneling machine, "Xingye", has reached 98%, but in fact, the main bearings of this series of shield machines have been dependent on foreign imports.
Now, the "Wall Breaker", China's first super-large shield machine main bearing jointly developed by Zhongjiaotian and the Chinese Academy of Sciences, has been reviewed by the expert group.
The expert group agreed that the indicators of domestic main bearings have reached the advanced level of similar imported products, and some of the indicators are in the international lead. Officials pointed out: this marks the most critical, important, and difficult link in the complete localization of China's shield machine manufacturing, and the shield machine is expected to achieve national production.
According to reports, the main bearing, with a diameter of 8.01 meters and a weight of 60 tons, is the first shield machine with the largest diameter and the heaviest single body developed in China, and can be used in super-large shield machines with a diameter of 16 meters. The design service life of the main bearing is more than 10,000 hours, and the sustainable excavation length will be more than 10 kilometers.
CTOnews.com here is a brief introduction. The main bearing is equivalent to the "heart" of the shield machine and is the key core component of the cutter head drive system of the shield machine. The main bearings used in imported shield machines not only have to bear high prices and long waits, but also have to bear risks such as quality. Under the influence of the current geographical conflicts, trade frictions, the epidemic situation of COVID-19, and other factors, we must overcome the "neck jam" technology of the main bearings of super-large diameter shield machines and realize national production.
Officials say that 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 main bearing with a diameter of 8 meters in operation can only carry a maximum axial force of 100, 000 Nm (equivalent to the weight of 2500 Asian elephants), a radial force of 10, 000 Nm and a capsizing torque of 100, 000 Nm.
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