Shandong Tian You Tunnel Engineering Equipment Co., Ltd. was established in 2010. It is a high-tech enterprise specializing in the R & D, production and sales of shield cutting tools, shield tail brushes and main bearings sealed oil and grease for urban rail engineering construction. The company covers an area of 16000 square meters, has more than 1800 employees, of whom more than 160 senior technical personnel. Over the years, relying on its own talents and technical advantages, strictly grasping the quality of the products, the company has taken the lead in the IS09001 international quality management system and the IS014001 international environmental management system, which have been certified by the China Quality Inspection Association as the national authority to test the standard products and issued the "country".