Which domestic company has its own shield machine technology?

Strictly speaking, Shanghai Tunnel Engineering Co., Ltd. and China Railway Tunnel Equipment Manufacturing Co., Ltd. have the ability to independently design and manufacture shields. Technically, Shanghai Tunnel Engineering Co., Ltd. is a little stronger. They have the ability to design and manufacture large slurry balance shield. It should be pointed out that the shield of Shanghai Tunnel Engineering Co., Ltd. did not copy other types of shields at all, but only referred to Japanese shields. China Railway's shield is basically based on the herrick shield. \x0d\ shield is a kind of large-scale electromechanical equipment, but it is not a complex electromechanical equipment, and everyone who knows a little about shield knows something about it. Therefore, the so-called shielding technology is actually not a high-tech technology, and it is not difficult for domestic enterprises to fully master its technology. Third-level and first-level enterprises will also begin to design and manufacture shields. \x0d\ Shenyang Heavy Industry cooperated with France NFM Company to produce bacterial wilt shield. Basically, NFM design drawings were brought to China for manufacturing. As of 2009, in addition to Shanghai Tunnel and China Railway, domestic shield manufacturers are: Herrick, Mitsubishi, Komatsu, Beizhong, Ishikawa Island, Kawasaki, Beijing Huatong Tunnel, Rottweiler, Okura and Hubei Tiandi Heavy Industry. \x0d\ By the way, I have been engaged in shielding technology for many years. If I am interested, I can go to the itbm forum, but don't pour water or make meaningless replies, because it will be immediately blocked by the administrator.