Crane hook over-hoisting protection device

Abstract

The invention discloses a crane hook over-hoisting protection device. Due to the addition of a damping device under a fixed pulley assembly, overloading problems such as hook over-hoisting or hanging storage caused by the failure of an upper-limit limit switch, an over-travel limit switch or a load sensor are solved, so damages to the crane structure and mechanism are avoided and the security of lifting load is improved. The high-safety crane relates to a device for preventing load hanging elements from falling off and is particularly suitable to be used in important places of nuclear power, metallurgy and aerospace and dangerous environment.

Description

technical field [0001] The invention relates to a safety device of a crane, in particular to a device for keeping a load hook component in place, and is intended to be used in high-safety cranes used in nuclear power, aerospace, metallurgy and other fields or in important places and dangerous environments. Background technique [0002] Cranes for lifting dangerous loads in nuclear power plants, such as ring cranes and fuel-operated cranes, are lifting equipment that require very high safety and reliability. The fall of the dangerous load of this type of lifting equipment will cause serious accidents, and multiple protection devices should be installed in the design to avoid such accidents. However, through the analysis of the accident cause of the crane load drop case, it is known that although multiple protection devices are installed on the crane, more than 80% of the accidents are caused by serious overloading such as the hook hitting the top or the load hanger. [0003]...

AI Technical Summary

Problems solved by technology

However, through the analysis of the accident causes of the crane load drop case, it is known that although multiple protection devices are installed on the crane, more than 80% of the accidents are caused by serious overloading such as the hook rushing to the top or the load hanger.

[0003] The traditional lifting mechanism cannot protect the lifting transmission chain when electrical faults such as the upper limit limit switch, overtravel limit switch, and load sensor failure cause severe overloading such as the hook rushing to the top or the load hanging on the warehouse. In the event of load fall or severe damage to the transmission chain, it is necessary to develop a safety protection system under the condition of severe overload of the hoisting mechanism

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