Common faults and treatment methods of electric hoists

Common faults and treatment methods of electric hoists

10 Sep 2019

Common faults and treatment methods of electric hoists
In some lifting equipment, electric hoist is a commonly used special lifting equipment. Installed on the crane and gantry crane, the electric hoist has the characteristics of small size, light weight, simple operation and convenient use. It is used in industrial and mining enterprises, storage docks and other places. However, there may be some common faults during use, what should we do?



1. After starting, the motor does not turn and cannot lift heavy objects.

(1) Excessive overload, no overloading is allowed

(2) The voltage is 10% lower than the rated voltage, and the voltage returns to normal.

(3) The electrical appliance is faulty, the wire is disconnected or the contact is poor, and the electrical appliance and the line are repaired.

(4) The brake wheel and the rear end cover are rusted and bitten, the brake wheel cannot be removed, the brake wheel is removed, and the rusted surface is cleaned.

(5) Motor broom, processed according to fault number 9

(6) The wire is too thin to replace the wire

2, the brake is not reliable, the sliding distance exceeds the specified requirements

(1) The spring pressure is reduced due to the large wear of the brake ring or other reasons, and the spring pressure is adjusted.

(2) The brake ring is in poor contact with the tapered surface of the rear cover, and the grinding is removed.

(3) The brake surface is oily, removed and cleaned

(4) The brake ring is loose and the brake ring is replaced.

(5) Pressure spring fatigue, replacement of spring

(6) The coupling is not moving or stuck, check the connection part

(7) The conical rotor turbulence is too large, adjusted according to regulations

3, the motor is too hot

(1) Overload use, load shedding

(2) The job is too frequent, reducing the number of jobs

(3) The brake clearance is too small, and the brake ring is not completely disengaged during operation, which is equivalent to additional load. readjust

4, the speed reducer is too loud

(1) poor lubrication, disassembly and overhaul

5. The motor beeps when starting

(1) Power supply and motor phase are small, repair or replace contactor

6. The heavy object rises to mid-air and cannot be started after parking.

(1) The voltage is too low and fluctuates greatly, and then restart after the voltage is restored.

(2) Overload lifting, load shedding

7, can not stop after starting, or when you reach the limit position, still do not stop

(1) AC contactor contact welding, quickly cut off the total power supply disassembly and repair or more

(2) The stopper is out of order, and the AC contactor is replaced.

(3) The inner end of the limiter is connected incorrectly, and the limiter line is repaired.

8, the reducer oil leakage

(1) Between the box and the cover, the seal ring is poorly assembled or damaged, and the repair or replacement seal is removed.

(2) The coupling screw is not tightened, tighten the screw

(3) Refueling excess, refueling according to regulations

9. The gap between the conical rotor or stator of the motor is too small to be rubbed (called broom)

The factory products are not allowed to "broom", the main reason for the occurrence of "broom" is: the bearing ring on the motor shaft wears, the rotor core is axially displaced, or the custom core displacement. Remove the replacement support ring so that there is a uniform gap between the stator rotor cones, 0.35~0.55mm on each side (small motor clearance is small) or sent back to the factory for overhaul.


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