The solution to the brake failure of the electric hoist of the port hoisting equipment

If the group hoist that has not been used for a long time starts when the operator needs it but does not operate after pressing the start switch, the common faults mainly have the following three conditions:

First, there is a problem with the power supply line. The electric hoist has a compact structure, and the electric hoist whose motor axis is perpendicular to the axis of the drum adopts a worm gear transmission device. Its disadvantages are: large length dimension, large width dimension, rough structure, low mechanical efficiency, and difficult processing. The hydraulic system is dual-controlled, and the pressure can be precisely controlled by the overflow regulating valve and the magnetic contact pressure gauge. The electrical control department adopts low-voltage control, which increases the safety of the control system. Due to long-term non-use, the main cable, stability, switch and other components often fail. The electric hoist has a compact structure, and the electric hoist whose motor axis is perpendicular to the axis of the drum adopts a worm gear transmission device. Its disadvantages are: large length dimension, large width dimension, rough structure, low mechanical efficiency, and difficult processing. The hydraulic system is dual-controlled, and the pressure can be precisely controlled by the overflow regulating valve and the magnetic contact pressure gauge. The electrical control department adopts low-voltage control, which increases the safety of the control system. General electricians or people with basic electrical knowledge can use the written test line to judge. They can work after repairing cables, switches, or safely replacing cables from scratch.



Secondly, when the power is connected, the motor of the chain electric hoist is found to move, but only the motor is heard; the humming sound; the hook cannot be raised or lowered. Analysis of the original reason: due to corrosion, the brake of the lifting motor could not be opened. Since electric hoist brakes that are not used for a long time are relatively easy to rust, they are not easy to turn over when they are used suddenly. When the operator discovers this situation, it is recommended to remove the rear brake housing of the lift motor and use a hammer to quietly strike the cone brake of the cone rotor motor;

Third, the voltage of the electric hoist of the group hoist is 10% lower than the rated voltage. The electric motor usually has too small starting torque, which makes the electric hoist work normally due to the lifting of the goods. When checking, the operator must use a multimeter. When measuring the voltage at the input terminal of the motor, if the voltage cannot be started because the voltage is too low, the electric hoist should be used after the system voltage reaches the normal rated voltage.