Zhaoyuan Dongtian Machinery Co.,Ltd.located in Zhaoyuan City of Shandong Province,the Capital of Gold in China .It is adjacent to Qingdao and Yantai .Founded in February 2001 on a land covering an area of 1600 square meters .The company is equipped with advanced steel grating production lines and slewing ring production lines , able to produce 12,000 tons of steel gratings,slewing rings and high-strength standard parys etc annually.At the same time ,the company also researches and produces internationally advanced medium frequency contravariant automatic steel grating and soket grating press...