China's "heart" is the most important weapon of the country! The main bearing of the world's largest diameter shield tunneling machine is offline in Changsha

Tech 2023-10-12 22:07:20 Source: Network

Replay suspend 00:07 / 01:20 direct seeding 00:00 Enter full screen 0 Click and hold to drag videos On the morning of October 12th, the main bearing of the 8.61 meter diameter shield tunneling machine independently developed by Chinese enterprises was offline in Changsha

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On the morning of October 12th, the main bearing of the 8.61 meter diameter shield tunneling machine independently developed by Chinese enterprises was offline in Changsha. Photographed by Guo Liliang, a full media reporter from Hunan Daily

Hunan Daily, October 12th (Reporter Cao Xian, Correspondent Hu Qing) This morning, the 8.61 meter diameter shield machine main bearing independently developed by Chinese enterprises was taken offline in Changsha. It is the largest, heaviest, and highest load-bearing integrated shield machine main bearing in the world to date.

This set of main bearings is independently developed by China Railway Construction Heavy Industry Group and can be used to drive 18 meter ultra large diameter shield tunneling machines. The product weighs 62 tons and is circular in shape. It has a height of 3 floors vertically and can withstand loads of over 10000 tons; In a raceway plane with a diameter of over 8 meters, the flatness requirement is less than 20 micrometers, and the manufacturing difficulty is no less than carving on rice grains.

The main bearing is known as the "heart" of shield tunneling machines in the industry. In the process of digging mountains, roads, and crossing rivers and seas, shield tunneling machines rely on it to drive the cutter head to continuously rotate and advance. Therefore, the main bearing needs to face the extreme harsh working conditions of the shield machine, such as overload, large eccentric load, and frequency variable load. Once the integrated structure is damaged, the shield machine faces the risk of scrapping. Previously, the key technology of the main bearings of ultra large diameter shield tunneling machines was monopolized by foreign enterprises for a long time.

It is understood that the main bearings of shield tunneling machines have been included in the 35 key technologies that restrict the development of China's industry, making them the "last link" for the full industrial chain of shield tunneling machines to become autonomous. With the support of national ministries, local governments, and China Railway Construction Corporation's key scientific and technological projects, China Railway Construction Heavy Industry has collaborated with upstream and downstream enterprises, as well as universities to carry out collaborative research. It has built an internationally leading production line for shield tunneling machine main bearings in the Changsha Second Industrial Park of China Railway Construction Heavy Industry, and created the world's largest main bearing working condition simulation test bench, solving the global problem of difficult testing and verification of large low-speed and heavy-duty main bearings.

Liu Feixiang, Chief Scientist of China Railway Construction Heavy Industry Group, introduced that the research and development team made efforts from multiple aspects such as design, materials, manufacturing, and testing, comprehensively tackling key problems, and ultimately achieved a breakthrough in the main bearing of 8.61 meter shield tunneling machine from scratch and from existence to excellence. Its successful development marks that the development and industrialization capabilities of domestically produced large diameter main bearings have reached a world leading level, achieving comprehensive localization of domestic shield tunneling machine main bearings from small and medium-sized diameters to large diameters, giving the domestic shield tunneling machine a full series of "Chinese hearts".

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