Zhaoyuan Dongtian Machinery Co., Ltd., located in Zhaoyuan City of Shandong Province, the Capital of Gold in China , 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 and able to produce 12, 000 tons of steel gratings, slewing rings , etc.annually.At the same time , the company also researches and produces internationally advanced medium frequency contravariant automatic steel grating and socket grating press welders.Currently, Dongtian Machinery Co., Ltd.is a large manufactory producing steel gratings , steel grating welding equipment and slewing ring in China. Relying on a business philosophy of �¢??Quality First, Customer First�¢??, the company ensures stable product quality , wins the praise and trust of customers worldwide and successively produces various types of steel gratings , slewing rings , high-strength standard parts and trench covers for a number of world-famous enterprises of Austrilia , the USA, Peru, Dubai, and so forth.With export sales accounting for over 80%, the steel grating enjoys a high reputation and a high popularity in the international markert.With its professional talents and expertise, and through cooperating with universities and scientific research institutions , the company successfully developed the third generation of steel grating welder-medium frequency contravariant automatic steel grating press welder , which integrates the welding , mechamical , electric, automatic control , hydraulic and pneumatic Technologies reaches international advanced level and fills the gap in China.As of now the medium frequency contravariant automatic steel grating and soket grating press welder has won more than ten national patents and become the preferred and best welding equipment for steel grating manufacturers.