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

Thanks to CTOnews.com netizen ZKSen for the clue delivery! CTOnews.com news on October 12, according to CCTV News, Changsha Evening News and other reports, the main bearing of the 8.61m diameter shield machine independently developed by Chinese enterprises went offline in Changsha today, which is by far the largest diameter, heaviest single, and highest load bearing of the integral shield machine in the world.

Its successful development indicates that the development and industrialization ability of domestic super-large diameter main bearing is among the leading level in the world, which means that the main bearing of shield machine has been fully localized, and the full coverage of domestic shield machine main bearing from small and medium diameter to super-large diameter has been realized.

According to the report, this set of main bearings, independently developed by China Railway Construction heavy Industry Group, can be used to drive 18-meter super-large diameter shield machines. the product weighs 62 tons, is three stories high, and can withstand a load of more than 10,000 tons; in a raceway plane with a diameter of more than 8 meters, the flatness is less than 20 microns, which is no less difficult to manufacture than carving on rice grains.

As the "heart" component of the shield machine, the main bearing needs to face the extreme adverse working conditions of the shield machine, such as overload, large partial load, frequency variable load and so on. Its service life and reliability are restricted by many key factors such as material, design, manufacture and test, and the difficulty of development increases with the increase of size. Prior to this, the key technology of the main bearing of super-large diameter shield machine has been monopolized by foreign enterprises for a long time.

According to the CTOnews.com inquiry, the main bearing of the shield machine is listed as the 35 "sticking neck" key technologies restricting the industrial development of our country, and it is the "last link" of the autonomy of the whole industrial chain of the shield machine. CCTV News said that with the smooth release of the main bearing of the 8.61-meter domestic super-large diameter shield machine, Chinese enterprises have thoroughly conquered and independently mastered the key core technology of the whole range of shield machine main bearing products from design, materials to manufacturing and testing. so that the domestic shield machine has a full range of "Chinese heart".

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