China's first remanufactured shield machine using domestically produced main bearings was successfully rolled off in Hefei. This indicates that China Railway Tunnel Group and Luoyang LYC Bearing Co., Ltd. (hereinafter referred to as Luozhou) jointly tackle the bottleneck of the main bearing of the shield machine, realize the localization of the main bearing of the shield machine, and end the long-term dependence on imports of high-end bearings in China.

Shield machines are widely used in urban rail transit construction, railway and highway tunnel projects, and water diversion projects. At present, a large number of shield machines face serious performance degradation, increasing use costs and even scrapping, and remanufacturing them have significant social and economic benefits. However, the key component of the shield machine, the main bearing manufacturing technology, has been monopolized by a few well-known bearing companies in the world and is the bottleneck for the remanufacturing of shield machines.

“After tackling the problem, we achieved breakthroughs in raw material design, bearing structure design, heat treatment technology research, precision manufacturing technology, testing technology and assembly technology, and created 6 independent intellectual property rights and main bearing materials for shield machine. Processing, testing and other special standards." Luo axis related person in charge, the main bearing diameter of this line is 2.6 meters, can meet the diameter of 6 ~ 7 meters of shield machine for more than 15,000 hours of continuous work. This shows that China has mastered the manufacturing technology of the main bearing of the shield machine, breaking the technological monopoly of a few multinational corporations, and has taken a crucial step to realize the comprehensive localization of the shield machine.

Yu Baolin, party secretary and chairman of China Railway Tunnel Group, said that the China Railway Tunnel entered the shield construction field earlier, and currently holds 87 sets of all-section tunnel boring machines. Based on the recovery and improvement of the performance of the original machine, the unit has formed the standard working process of the “eight-step method” for shield remanufacturing in many years of exploration, formulated the inspection system and standards for the shield, and introduced the professional equipment supervision mechanism. It has solved the problems of “remanufacturing standards”, “market recognition”, “professional subcontracting” and “component inspection”, and has become a nationally recognized pilot unit for shield remanufacturing and industry-leading enterprises. In 2016, the Ministry of Industry and Information Technology identified the pilot unit for shield remanufacturing. The China Railway Tunnel Group was the only construction company to be included in the pilot unit for shield remanufacturing.

Sun Qilin, general manager of Luozhou, said that China Railway Tunnel Group Co., Ltd. dared to innovate and dare to try in the remanufacturing of CT006H shield machine, which played a very good leading role in the remanufacturing of China's shield machine, and also greatly promoted it. The localization process of the main bearing of the shield. The innovative model jointly developed by the host user and the bearing manufacturing enterprise will also serve as a demonstration for the localization of the main bearing of China's shield.

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