Among all kinds of hoisting machinery, electric single girder cranes, electric hoist bridge cranes, electric hoist gantry cranes, etc. all use electric hoists as the lifting mechanism of hoisting machinery. In addition to the large and small car traveling mechanism and the main force and components, the electric hoist is prone to failure as a lifting mechanism.
First, the contactor is prone to adhesion and failure.
Second, the conical brake and the motor rotor brake shaft are prone to distortion and cracking.
During the lifting and lowering of the electric hoist, there will be many inching operations, the conical brake will be opened and closed frequently, and the brake will be repeatedly subjected to starting torque and braking torque, which is prone to fatigue and cracking.
After the brake shaft is cracked, the braking torque cannot be transmitted to the drum, and the heavy objects lifted by the hoisting machinery with the electric hoist as the lifting mechanism will fall under the action of gravity.
Post time: Dec-28-2022