Shandong yuanzheng petroleum equipment co. Ltd., is one professional manufacturer in Chinese drilling rig industry. Now, company has achieved American petroleum institute (API) quality management system certification. Her main products are zj20/1350, zj30/1700, zj40/2250, zj50/3150 and zj70/4500 mechanical oil rigs, electrical vf digital-control oil rigs, DC electric oil rigs, independent rotary table driven oil rigs etc. At the same time, yuanzheng also can supply related series accessories, such as derricks, substructures, draw works, crown blocks, rotary tables, linkage machines and all types of driven units.