After the electric hoist is added to the crane, the crane becomes a double electric hoist crane. The lifting capacity of the two electric hoists can be greater than the rated lifting capacity of the crane manufactured by the single beam crane manufacturer. In this case, the crane may be overloaded, resulting in serious potential damage to the main beam.
Because the control and safety protection system of single beam electric hoist produced by single beam crane manufacturer can not meet the requirements of double beam electric hoist, there are dangerous factors such as overload and collision of electric hoist in the process of use, which greatly reduces the safety performance of electric hoist. In case of improper operation, accidents, equipment damage or personal accidents are easy to occur.
If the electric single beam crane needs to be installed with electric hoist, for the sake of safety, it is necessary to not only change the stress form of the main beam, but also change the system and add some safety protection devices. After transformation, it can be put into use only after passing the inspection.
The specific requirements are to set overload limit and travel switch on the two electric hoists of the improved crane. In addition, single action / linkage switch shall be set to realize single action / linkage conversion function and protection function under corresponding working conditions, so as to fully ensure the safety of crane operation.
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