Used in high-temperature environments:The cab of the electric chain hoist should be an enclosed cab with an electric fan or air conditioning.The motor winding and casing should be embedded with thermistors and other temperature control devices.When the temperature exceeds the limit,turn off the power to protect or increase the strong cooling measures of the motor(usually by adding a special electric fan on the motor).
The electric chain hoist also has its own protection system.It is precisely because of this protection system that the chain electric hoist can maintain normal operation and ensure the operator's own safety.
The following measures should be considered for electric chain hoists operating in dusty environments:the driver's cab should be closed to protect the driver's personal health;The protection level of the motor and main electrical equipment on the chain electric hoist should be improved accordingly.Under normal circumstances,the protection of the motor and electrical appliances of the crane is IP44.According to the degree of dust,the sealing performance should be correspondingly improved,that is,the protection(mainly to increase the dust prevention ability level to IP54 or lP64).
Use in a humid environment:Under normal circumstances,when the humidity in the working environment of the chain electric hoist is not more than 85%,the protection level of the chain electric hoist is IP44.However,it is currently required to adapt to high humidity and humidity conditions.Yes.Nuclear power plants also have edge dust pollution from nuclear equipment that can be cleaned with high-pressure water.The protection level of the lifting equipment used must be increased.Therefore,the electrical protection level of cranes and cranes is used in areas with humidity greater than 85%.It should be IP55.In humid environments,motors above 10kW should use additional preheating and drying devices.When the chain electric hoist of an outdoor crane operates in special environments such as dust,humidity,high temperature,or cold,in addition to general protective measures,protective measures that can adapt to special environments should also be considered.
The voltage protection failure circuit structure has a voltage loss protection function.When the power supply is restored after a power outage,it is necessary to press the chain electric hoist again to restart the operation,which avoids the possibility of the crane operating on its own.The metal structure and pipe groove of the grounding protection metal mechanism,as well as all electrical equipment on the crane,provide reliable grounding on the low-voltage side of the transformer.The grounding resistance of the electric chain hoist is≤0.1Ω.Short circuit protection:When the chain electric hoist is short circuited,the main circuit breaker will automatically trip for protection.Overload protection:Once the wire rope chain electric hoist is overloaded,the chain electric hoist will immediately trip for protection.Pull limit protection:When the chain electric hoist rises to a limited position,it will automatically cut off power and protect the equipment.