... solutions provid QD type double beam overhead crane1.IntroductionThis crane mainly consists of strong bridge beams,trolley-travelling mechanism ... working duties,e.g. A5,A6,A7,according to the working frequency and pure working time.2.Control methodRemote ... button , cabin control3.Design and construction rulesAll the standards required for the crane is according to China Standards.4.PaintingPrimer and ...