Common problems of wire rope hoist: no parking, rail gnawing, wear wire rope
First: the electric hoist cannot stop or does not stop when it reaches the limit position:
Most electric hoist cannot be stopped mainly because of the welding of the contact head of the contactor. When the stop switch of the hoist is pressed, the contact head of the contactor cannot be disconnected, so that the motor will operate normally and the hoist will not stop.
If the electric hoist to the limit position still does not stop, such as limit device failure, in this case, immediately cut off the power supply, so that the electric hoist forced to stop.After stopping the machine, check the contactor or limit device. If it is seriously damaged and cannot be repaired, it must be replaced before it can be used normally.
Second: the cart that drive a car runs wheel and car run wheel, appear likely to chew orbit phenomenon in walking process.
Part 1 is a congenital problem that arises during the manufacturing and assembly process.
Part 2 deals with acquired problems that arise during use and maintenance.
To sum up, we can see that the root cause of rail gnawing is the unequal wheelbase;The axes are not parallel;The diagonal is not equal;The wheels are not at the same level.
Third: wear is the most common phenomenon of wire rope damage, generally divided into external wear, deformation wear and internal wear 3 kinds of circumstances.
1, external wear and lubrication: wire rope in the process of use and pulley groove, drum wall, hook and other object surface contact, resulting in the rope diameter will become thinner, the surface of the fine steel wire is polished, so that the load of the steel wire cross-section area reduced, wire rope load decreased.
2, deformation and wear: deformation and wear is a phenomenon of partial wear of steel wire rope, usually caused by vibration, collision and other reasons.
3, internal wear: internal wear refers to the running process of the wire rope, different strands of steel wire friction between each other, resulting in internal steel wire wear.
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