Henan Hongji Mining Machinery CO.,Ltd. is an import & export enterprise , a joint-stock enterprise that mainly manufactures large-sized and medium-sized mining machines , metallurgy machines and equipments for processing building materials . 　　　The headquarter is located at advanced technology development department in Zhengzhou city , which is the capital of Henan province and the transportation city of China . This headquarter covers 80000 square meters . There are more than 800 staff in Hongji , including 138 senior engineers and more than 200 skilled workers. Though it has its own R&D department , Hongji cooperates with many domestic and foreign high-tech research companies . And it adopted many foreign advanced technologies .