Located in High-tech Zone of Weifang City with registered capital of 50 million yuan, Shandong Tianrui Heavy Industry Co., Ltd. is a high-tech enterprise engaged in drilling machinery research and development. We are supported by some key projects of the Ministry of Science and Technology, mainly from the National Development and Reform Commission, the Ministry of Industry and Information Technology and Bureau of Ocean and Fishery, and are also have five provincial innovation platform include Rock Mechanical Engineering Technology Research Center, Enterprise Technology Center and Rock Drilling Machinery R&D Center in Shandong province. Tianrui Heavy Industry has a a high-level innovation R & D team. We have 155 National authorized patents, including 20 invention patents. With perfect quality system, Tianrui has passed the ISO9001: 2008 international quality system, environment system, occupational health system, measurement management system certification, CE certification and MA certification, becoming AAA grade good standardization enterprise in Shandong Province. Tianrui's main products are rock drill, hydraulic breaking hammer and chisel, high pressure DTH hammer and drill bit, drill rod, intelligent mortar spraying machine and grouting pump, high frequency crushing device. The YT28 air-leg rock drill used for tunnel driving . High drilling speed, low failure rate and the long operating life of wearing parts are widely praised by our users. YT 28 was honoured as the best and most reliable Chinese rock drill, is the "Shandong famous brand" and "National Machinery industry customer satisfaction products". The hydraulic breaking hammer and chisel, high pressure DTH hammer and drill bit, drill rod which Tianrui produced have the advantage of long operating life, high crushing efficiency and low failure rate, makes them the first choice of our customers. And the high frequency crushing device also is widely recognized by users for it’s high construction efficiency,