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[CCTV live news room]The main bearing of the world's largest diameter Shield Machine rolled off the production line today
[CCTV live news room]The main bearing of the world's largest diameter Shield Machine is offline today.“Stuck in the neck”Technology opens up new space for global market
[CCTV Punctual Finance]The main bearing of the world's largest diameter Shield Machine rolled off the production line on the 12th
[CCTV live news room]The main bearing of the world's largest diameter shield machine is offline.
[Hunan News Network]The main bearing of the world's largest diameter shield machine is offline in Changsha.
[Hunan Economic TV News]Domestic shield machine“Chinese heart” Diameter 8.61 meters！Main bearing of the world's largest diameter shield machine“Made in Changsha”
October 12，Independently developed by China Railway Construction Heavy Industry Co., Ltd..The main bearing of the 61-meter shield machine is offline in Changsha.，This is the largest diameter in the world so far.、The monomer is the heaviest、Main bearing of integral shield machine with the highest bearing capacity。Its successful development，It marks that the development and industrialization ability of domestic super-large diameter main bearings ranks among the world's leading level.，It means that the main bearing of the shield machine has been fully localized.，It has realized the full coverage of the main bearing of the domestic shield machine from small and medium diameter to super large diameter.。
Equip China with the most important weapon for the country“Heart”
Offline site
President of China Railway Construction Corporation、Wang Lixin, Deputy Secretary of the Party Committee, delivered a speech.
Speech by Su Zimeng, President of China Construction Machinery Industry Association
Secretary of the Party Committee of China Railway Construction Heavy Industry、Chairman Zhao Hui delivered a speech
Chief Scientist of China Railway Construction Heavy Industry、Liu Feixiang, Director of Enterprise Technology Center, introduced the independent innovation of the main bearing of the Roadheader.
Group photo of leaders and guests at the scene
This set of main bearings is independently developed by China Railway Construction Heavy Industry Group.，Can be use for driving an 18m super-large diameter shield machine，The product weighs 62 tons.，Three storeys high，Capable of bearing over ten thousand tons of load；In the raceway plane with a diameter of more than 8 meters，Flatness less than 20 microns，It is no less difficult to make than to carve flowers on rice grains.。
8.Main bearing of 61m shield machine
Main bearing as shield machine“ Heart ”Component，It is necessary to face the shield machine with super heavy load.、Large partial load、Test of extreme working conditions such as frequency variation and load variation，Its service life and reliability are affected by the material.、Design、Many key factors such as manufacturing and testing are restricted.，The difficulty of development is multiplied with the increase of size.。Before，The key technology of main bearing of super-large diameter shield machine has been monopolized by foreign enterprises for a long time.。
It is understood that，In order to break through the weak link of full autonomy of the whole industry chain of shield machine，In the national ministries、With the support of local governments and key science and technology projects of CRCC，Railway Construction Heavy Industry Joint Upstream and Downstream Enterprises、Colleges and universities carry out collaborative research，A research and development team led by Liu Feixiang, chief scientist of Railway Construction Heavy Industry, has been set up.，The second industrial park of Changsha Railway Construction Heavy Industry has built the largest one in China.、International leading shield machine main bearing production line，Has been successfully developed 3 meters to 7..6m full range of main bearings，The world's largest main bearing working condition simulation test bed has been built.，It solves the worldwide problem that large low-speed and heavy-duty main bearings are difficult to test and verify.。
The world's largest main bearing working condition simulation test bench
Under development 8.61m shield machine main bearing process，Development team from design、Material、Manufacture、Multi-directional efforts in test and other links、Comprehensively tackle key problems，Finally, a diameter of 8 was achieved..Breakthrough of main bearing of 61m shield machine。In independent design，The R & D team has developed a professional calculation software for large-diameter heavy-duty main bearings.，Hundreds of materials and processes have been tried，Thousands of theoretical checks and design optimizations have been carried out，Through 3 meters to 7.Design of 6m Diameter Main Bearings with Various Specifications、Manufacture、Closed-loop validation improvement of the test。
At the same time，In the process of material attack，High-performance and long-life bearing steel has been successfully developed by China Railway Construction Heavy Industry Joint Steel Plant；In the manufacturing process，And effectively solve that problem of deformation control of the thin-walled re under the condition of ultra-large dimension.、High-precision large-modulus tooth hard milling、Complex surface heat treatment and other manufacturing problems；In the test verification，Through the working condition simulation test of multi-specification main bearings，It fully verifies the highly reliable service ability to adapt to complex and harsh working conditions.。
It is reported that，The main bearing of shield machine is listed in 35 items that restrict the development of China's industry.“Stuck in the neck”Key technologies，The whole industry chain of shield machine is independent.“The last link”。With 8.The main bearing of the 61-meter domestic super-large diameter shield machine rolled off the production line smoothly，Tiejian Heavy Industry has thoroughly conquered and independently mastered the design of the whole series of main bearings of shield machines.、Material to manufacturing、Key core technologies in the whole test process，So that the domestic shield machine has a full range of China“Heart”。
