There are five common problems and reasons in the inspection of safety device of building elevator.
1. The action speed of centrifugal device is unstable
Reason: spring breaks down, the rotating roller is not flexible.
2. When the safety device is running for test after installation, the centrifugal device operates normally but cannot brake
Reason: the stroke of centrifugal device is not enough to mesh with the protrusion of the inner wall of the drum
3. The speed of centrifugal device is qualified, but the operating speed deviates from the normal value after assembly.
Reason: the gap between gear shaft and the copper tile is too large.
4. The maximum braking torque of the brake cannot meet the requirement or the maximum braking torque is unstable
Reason: brake is oiled or blotted, the spring is damaged, the gap between the large copper nut and screw is too large, the brake belt is partially damaged and detached, and the contact area decreases; brake belt is expanded due to dampness,
5. Gear rotation is not flexible
Reason: gear shaft is rusted, bearing bush is damaged, brake belt is expanded or damaged.