As a manufactory and an exporters, Zhangqiu Dacheng Machinery co., ltd is established in the middle period of the nineteen eighties, and is in the Mingshui Zhangqiu City Shandong Province China. It’s near the highway of Jinan to Qingdao and the Mingshui Station of Jiaoji Railway. The fixed assets of our company is more than 30 million Chinese Yuan now, the factory covers the area of 20000 square meters. The main products are Tower crane, Roots blower and Construction elevator. Beautiful geographical environment, convenient traffic facilities, rich technical force injects limitless life and vigor into development of our company. Tower crane as the leading industries of our company, the company took the lead with Beijing Construction Machinery Research Institute, has developed a domestic industry-leading technology level size of QTG20, QTG25, QTZ25, QTZ31.5, QTZ40, QTZ63, QTZ80, QTZ100, QTZ125, QTZ160 tower crane . To improve the quality of products, we all use domestic famous brand of accessories, all before welding with CO2 gas arc welding. In order to supply better serve to our customers, our company established Beijing, Shanghai, Nanjing, Wuhan, Hefei, and Tianjin, more than 30 sales points, have opened a computer network of the customers files, to make our services more circumspect so that customers can feel more satisfaction. DSR Roots air blower is made by the new technical base on the wealth of making experience of Zhangqiu Dacheng Company. This machine uses the new line through the impeller, causes the air blower to divulge lowly, efficiency high, the noise is small. The operation of blower in dry condition has become practical at the discharge pressure as low as 0.8kgf/cm2 The purpose of the DSR roots blower: The DSR roots blower is mostly used in dealing water, air transporting, combustion furnace, washing, vacuum packaging, electricity industry, cement industry, petrochemical, food industry and etc.