Chain hoists looks sound like a structure, easy operation, small lifting gear for everyone, but if do not understand its mechanical properties, improper operation, poor management and maintenance, will be an accident. Lifting operations is responsible for and hoist operators, local management must be familiar with the safe use of manual lifting gear rules. Guangzhou gongyou lift slings machinery co.,ltd is a collective enterprise specializing in research, production and sales of lifting machine. It is a modern enterprise in manufacturing of chainblock ,electric hoist , lifting slings ,steel wire rope , rigging hardware and so on .