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What are the faults of electric hoist? |
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1、 It is easy to cause adhesion and failure of contactor. 2、 The brake shaft of cone brake and motor rotor is prone to twist and fracture. During the lifting and descending process of electric hoist, there will be many inching operations. The conical brake will open and close frequently, and the brake will be repeatedly affected by the starting torque and braking torque, which is easy to produce fatigue fracture. When the brake shaft is broken, the brake torque cannot be transmitted to the drum, and the heavy objects lifted by the electric hoist will fall under the action of gravity. 3、 When the lifting height limiter of the lifting machinery fails or the lifting contactor in the control electrical cabinet is stuck or stuck, the lifting mechanism will run upward all the time, resulting in over winch, and the hook group impacts the drum, resulting in the deformation of the drum. The drum is connected with the output shaft of the reducer through gear meshing, and the output shaft of the reducer is easy to fracture under the impact. If the drum is replaced in the process of maintenance and the output shaft of the reducer is not checked, the broken output shaft of the reducer will cause the weight to slide down. 4、 It refers to the failure and damage of the safety protection devices of the lifting machinery, such as the failure of the lifting height limiter, the damage of the lifting weight limiter, and the failure of the travel limiter of the crane traveling mechanism. |
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