Why does the elevator jitter and oscillate when it is running (2)

Why does the elevator jitter and oscillate when the elevator is running? (2) When the elevator is running, there are many reasons for jitter and oscillation, which may be caused by a failure of a component, or may be caused by changes in the overall performance of the system. It may even be the result of the joint action of the two. In the article "Why the elevator jitters and oscillates when it is running (1)", the editor introduced ten reasons for elevator jitter, and these reasons are also related to elevator machinery. The editor will give you an in-depth introduction from other aspects!

1. Electrical

1. Traction torque fluctuations of the traction machine, poor torque adjustment during starting, too small torque, and excessive torque will cause the elevator car to shake.

2. If the series impedance of the main drag circuit is not adjusted properly, the jitter will be abnormal when the slow car is running.

3. The tachogenerator is faulty and the feedback is very unstable.

2. Elevator product quality

1. The bearing clearance of the traction wheel and guide wheel of the main engine is large, the dynamic balance of the traction wheel and the guide wheel itself is poor, the bearing in the traction machine or gear box is poor, and the concentricity of the worm gear of the traction machine reduction box and the motor shaft Periodic vibrations can occur when over-tolerance, resulting in elevator jitter. First of all, the product quality and assembly quality of traction wheels and guide wheels should be improved, and bad bearings should be replaced in time to eliminate periodic vibration.

2. The stiffness of the rope rod spring is different in the spring under the same compression amount. The stiffness of the rope rod spring must be moderate and matched with its load capacity. If the stiffness is too large or too small, the damping effect will not be good.

3. Poor elevator installation

Poor installation of elevator guide rails is mainly due to the verticality, spacing, rail joints and joint steps of the guide rails exceeding the error range specified by the national standard. During the installation process, the poor protection of the product causes partial distortion of the guide rail, pits or electric welding scars on the working surface of the guide rail, which can cause vibration and noise when the elevator car runs up and down.

4. Improper elevator debugging

1. Improper adjustment of the slide guide gap, improper adjustment of the parallelism of the guide slide, and too large or too small expansion and contraction of the slide guide will cause the elevator to shake.

2. The fluctuation of the traction torque of the main engine is the excitation source of elevator vibration. If the torque is improperly adjusted, if the torque is too small, reverse pull will occur, and if the torque is too large, it will appear first, and it will cause jitter. Jitter can be reduced by adjusting the torque or acceleration curve at the moment of starting, thereby improving the comfort of starting.