How do you handle the failure of the crane
When the brake suddenly fails, the driver should be calm, calm and take reasonable measures to minimize or eliminate possible accidents and losses. Solution: one: when the brake suddenly fails, a point car or anti-car operation should be carried out immediately. Point of car and the car after the operation, if the failure situation continue to exist, it should be based on objects at the time of case, motor and effective emergency measures, and issued a warning signal, if the job content close to the ground, fall down and there is no danger, should be the last block in the brake pull to fall, in normal operation way, put the required items. It is not allowed to fall freely. If in the original position falls directly on the object will cause an accident, is decided to drive the car, the controller handles step by step to turn to the last step in the direction of rising (pay special attention to, at this time can't turn control handle to the last step, because action too fast will make over-current relay action). While moving the controller handle to the upward direction, it is important to keep the big, small car (or torsion bar) in a safe position to keep the object down. If the above measures are taken, if it is up again, the big, small car (or a torsion bar) will not be able to drive the car to a safe position, and it will be raised again and again and again and again.
The condition of the lifting mechanism for the lifting of the hook after the lifting of the lifting mechanism is called the brake failure. The sudden failure of the brake can cause the hook to drop rapidly, causing major equipment accidents and personal accidents. Every driver should have a high sense of responsibility, take care of prefixing and prevent the sudden failure of the brake.
Two: operation error. The controller does not stop at zero when the stop. The brake electromagnet was not without power, and the crane did not stop. But the driver mistakenly thought he had been "parked", so the phenomenon of the rapidly falling load was that the brake failed. Manipulate controller handle method is not correct root cause of this situation, the lack of practical experience driver, not easy to quickly find the reasons why this happens. The cause of the brake "false failure" has been eliminated after the operation of a point car or an anti-car. Three: a two-stage reverse connect braking PQR6402 contactor control panel declines cannot be closed fault occurs, the levels by reverse connect braking switch to renewable drop, because the brake contactor is closed (brake brake), and motor is not electricity, so the hook will be free to fall. Stop immediately in this situation. The free-fall of the hook is usually called a "false failure". But it happens when the controller is in a regenerated position, and when the controller comes back to zero, it doesn't exist.
