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A Comprehensive Guide to Troubleshooting Common Faults in Bridge Cranes
Bridge-type Crane It is an indispensable piece of equipment in modern industrial production, widely used in lifting, transporting, loading and unloading, and installation operations for various types of goods. It plays a significant role in improving labor productivity. During operation, bridge cranes inevitably encounter certain problems that prevent them from functioning properly. Below, we have compiled a list of common troubleshooting guides for cranes:
1. Brake failure: the vehicle cannot be brought to a stop—repair the electrical system; replace the brake linings; replace the worn-out main spring; and adjust the brake according to technical specifications.
2. Brake cannot be released: eliminate any jamming; adjust the main spring to meet specifications; or replace the brake screw; replace the coil.
3. Brake linings emit a burning smell and smoke, and wear rapidly: Adjust the brake to ensure uniform clearance so that the linings can disengage from the brake wheel during operation; replace the auxiliary spring; and dress the working surface of the brake wheel.
4. Unstable braking torque: Adjust the concentricity to ensure consistency.
5. If the hook assembly becomes detached, immediately repair the hoisting limit switch; overloading is strictly prohibited; replace the wire rope.
6. Hook head is skewed and rotates inflexibly: replace the thrust bearing.
7. Periodic vibration and noise in the reducer: Replace any damaged gears.
8. Vibration and excessive noise from the reducer on the bridge: tighten the bolts; adjust the concentricity to meet the specified standards; reinforce the support structure to increase its rigidity.
9. Slippage during trolley operation: Adjust the height of the wheel axles to increase the contact pressure of the drive wheels; adjust the elevation difference of the track.
10. Large-wheel rail biting: Inspect the key connections of the drive shaft, the meshing condition of the gear couplings, and the bolted connections of all components; eliminate excessive clearances and ensure coordinated transmission at both ends; adjust the installation accuracy of the wheels and align the tracks for the large wheels.
11. Overheating of the motor during operation: Reduce the crane’s starting frequency, decrease the load, or replace the motor with one that matches the duty class.
12. Vibration during motor operation: Replace the damaged bearing.
13. Controller freezes during operation: Replace the contacts.
14. Causes of the main contactor failing to close: no supply voltage; blown fuse; controller handle not in the zero position; emergency switch and interlock contacts not closed; main contactor coil burned out.
15. Causes of unidirectional operation of the large vehicle: poor contact in the limit switch or a broken connecting wire; poor contact or open circuit in the controller interlock contacts; or poor contact between the reversing coil and other auxiliary normally closed contacts.
16. Causes for the auxiliary hook failing to rise: the upper limit switch is open; poor contact; broken slip wire.
Keywords:
Crane
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