Wire rope electric hoists are used in single beams, bridge cranes, gantry cranes, and suspension cranes. Therefore, it is an indispensable machine to improve labor efficiency and improve working conditions. There may be some failures in the use of wire rope electric hoists. The causes and treatment methods of the failures are as follows:
| Fault | main reason | Approach |
| After starting, the motor does not rotate and heavy objects cannot be lifted | Severely overloaded | Overloading is not allowed |
| The power supply voltage is more than 10% lower than the rated voltage | Wait for the voltage to return to normal | |
| The electrical appliance is faulty, the wire is disconnected or the contact is poor | Overhaul electrical appliances and wiring | |
| The brake wheel and the rear end cover are rusted and seized, and the brake wheel cannot be disengaged | Remove the brake wheel and clean the rusty surface | |
| There is friction between the outer surface of the motor rotor and the inner hole of the stator | According to Article 9 | |
| The wire is too long or the cross-sectional area of the wire is small | Replace the wire that meets the requirements | |
| The braking is unreliable and the sliding distance exceeds the specified requirements | The spring pressure is reduced due to excessive wear of the brake ring or other reasons | Adjust according to the method shown in Figure 4 and Figure 5 to increase the spring force |
| Poor contact between the brake ring and the cone of the rear cover | Remove for grinding | |
| Grease on the braking surface | Remove for cleaning | |
| Loose brake ring | Replace the brake ring | |
| Pressure spring fatigue causes pressure to decrease | Replace the spring | |
| The motor shaft extension does not move well or stuck in the coupling | Check its connection part | |
| Motor temperature rise is too high | Overload use | Not allowed |
| Homework too frequently | Operate according to 25% and 120 times/hour | |
| The brake gap is too small, and the brake ring is not completely disengaged during operation, resulting in friction and heating | Re-adjust the gap | |
| The reducer noise is too loud or abnormal | Poor lubrication | Disassembly and maintenance |
| Excessive wear of gears, excessive clearance between teeth | ||
| Gear damage | ||
| Bearing damage | ||
| The motor buzzes when starting | Power supply or motor phase loss | Check the input power, overhaul the motor |
| Poor contact of the AC contactor, resulting in a lack of phase in the motor | Change contactor | |
| The heavy object rises into the air and cannot be restarted after stopping | The voltage is too low or fluctuates greatly | Wait for the voltage to return to normal and restart |
| After starting, it can’t stop, or it still doesn’t stop when it reaches the limit position | Fusion welding and sintering of AC contactor contacts | Cut off the power quickly, overhaul or replace the AC contactor |
| Stopper malfunction | Repair or replace the stopper | |
| Reducer oil leakage | Poor assembly or failure of the sealing ring between the box body and the box cover | Remove the overhaul or replace the sealing ring |
| The connecting screw is not tightened | Tighten the screws | |
| The gap between the cone rotor and the stator of the motor is too small to cause friction (sweeping the bore) | “Sweeping the bore” is not allowed for the factory products. The main reasons for the “sweeping” are: the support ring on the motor shaft is severely worn, the rotor core is axially displaced, or the stator core is displaced | Dismantle and replace the support ring, so that there is a uniform gap of 0.35-0.55mm between the cone surfaces of the stator and rotor (smaller motors take the smaller value), or send it back to the manufacturer for repair. |
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