Elevator Compensating Rope Vibration Damping via Sheave Displacement
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Solution Overview
Problem
Conventional elevator systems face challenges in damping lateral vibration of compensating ropes during earthquakes or strong winds, leading to potential detachment from the compensating sheave, which disrupts elevator operation and requires maintenance.
Innovation Solution
An elevator system with a guide member and holding unit that allows the compensating sheave to be vertically displaceable and horizontally movable, using a driving unit and controller to detect and dampen lateral vibrations without causing detachment, by displacing the sheave in a manner that maintains rope engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rope locking member is placed close to the compensating sheave to damp lateral vibration of compensating ropes, then the vibration damping effect is improved, but the compensating ropes may disengage from the compensating sheave causing detachment
Solution Approach 1:
A guide member is introduced as an intermediary component between the rope locking member and the compensating sheave. The guide member extends from the compensating sheave along the axial center direction and guides the rope locking member, ensuring that the compensating ropes remain properly engaged with the compensating sheave while still allowing effective vibration damping to occur.
Solution Approach 2:
The guide member utilizes the existing tension and positioning forces in the compensating rope system to automatically maintain proper rope engagement. The structure allows the rope locking member to naturally follow the guide member's path, self-correcting any misalignment that could lead to detachment while maintaining damping effectiveness.
2Stability of the object's composition
If the rope locking member displaces compensating ropes in the horizontal direction to damp vibration, then lateral vibration is reduced, but the ropes may become inclined and disengage from the sheave
Solution Approach 1:
The guide member acts as a mediator that constrains the horizontal displacement of the rope locking member to follow a controlled path along the axial center direction. This ensures that the compensating ropes are displaced sufficiently to damp vibration while preventing excessive inclination that would cause disengagement from the compensating sheave.
Data Source
AI summary
An elevator includes a compensating sheave, a compensating rope, a guide, a holder, a driver, a lateral vibration detector, and driver controller. The compensating rope is looped around the compensating sheave to be bent back upward in a hoistway, and has a first end connected to a car and a second end connected a counterweight, the compensating rope suspended from the car and the counterweight. The guide guides the compensating sheave in a vertically displaceable manner. The holder holds the guide to be displaceable in a horizontal direction. The driver drives the holder in the horizontal direction. The lateral vibration detector detects lateral vibration of the compensating rope. The driver controller controls the driver based on a result of detection by the lateral vibration detector and accordingly drive the holder in the horizontal direction so as to dampen lateral vibration of the compensating rope.