1. The steel plate lifting pliers are usually small in size, simple in mechanism, and can complete the lifting and horizontal movement.

　　2. There are many kinds of heavy objects lifted by the pliers, and the load is constantly changing. Some heavy objects weigh hundreds to thousands of tons, some objects are tens of meters long, irregular shape, loose particles, heat and thaw state, inflammable and explosive dangerous goods and other lifting process is complicated and dangerous.

　　3, lifting pliers exposed, moving parts, often direct contact with crane operators, there are many accident risk factors.

　　4. Complex operating environment. From large iron and steel complex to modern ports, construction sites, railway hubs, tourist resorts with lifting tools to run; The workplace often encounters high temperature, high pressure, inflammable and explosive, transmission lines, strong magnetism and other risk factors, which will pose a threat to equipment and operators.

　　5, hanging pliers often need more than one person to cooperate. A use of demand command, strapping, driver and other operators skilled cooperation, movement coordination, mutual care. Operators should have the ability to handle field emergencies. It is often difficult for multiple operators to work closely together, often with great difficulty.

　　The above working characteristics of hanging pliers determine that it has a great relationship with the use and production. Any negligence in the design, manufacture, installation, use and maintenance of lifting tongs may cause casualties or equipment accidents. On the one hand, it will cause casualties, on the other hand, it will cause great economic losses.

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