Elevator Rope Routing Reduces Aperture Interference
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Solution Overview
Problem
Conventional elevator refurbishing methods face challenges in reducing the distance between main rope portions passing through apertures in the machine room, leading to interference with the hoisting machine and increased construction time, especially when transitioning from a 1:1 to a 4:1 suspension method.
Innovation Solution
The method involves winding main ropes onto car and counterweight sheaves from sides further away from the driving sheave than the sheaves themselves, allowing the ropes to cross each other within common apertures, reducing the distance between rope portions and avoiding interference with the hoisting machine, facilitating easier installation and reducing the need for larger apertures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the direction-changing pulley is positioned close to the hoisting machine to reduce rope distance, then the installation time is reduced, but the pulley interferes with the hoisting machine
Solution Approach 1:
The patent resolves the spatial conflict by changing the rope routing configuration from a direct horizontal path to a path that utilizes vertical and diagonal dimensions. The rope extends horizontally from the driving sheave to a point beyond the car suspending sheave, then angles upward to the direction-changing pulley, effectively using three-dimensional space to avoid interference while minimizing distance.
2Object-affected harmful factors
If the direction-changing pulley is separated horizontally from the hoisting machine to avoid interference, then the interference is eliminated, but the distance between rope portions increases requiring larger penetrating apertures
Solution Approach 1:
The patent employs multi-dimensional routing where the rope transitions from horizontal to diagonal and vertical paths. This allows the rope to achieve sufficient separation from the hoisting machine to eliminate interference while maintaining a compact overall configuration that does not require excessive aperture size.
Solution Approach 2:
Instead of positioning the direction-changing pulley close to the hoisting machine and then finding ways to avoid interference, the patent inverts the approach by first establishing the optimal rope routing path that naturally provides separation, then positioning the pulley according to this routing. This reverse planning ensures both interference avoidance and minimal distance.
3Device complexity
If common penetrating apertures are used for multiple rope portions, then the number of apertures is reduced, but the aperture size must be enlarged to accommodate longer rope distances
Solution Approach 1:
The patent's three-dimensional rope routing optimizes the path length from the driving sheave to the car suspending sheave and then to the direction-changing pulley. This spatial optimization ensures that even though multiple rope portions pass through a single common aperture, the total distance remains minimized, preventing the need for excessively large aperture sizes.
Data Source
AI summary
A car and a counterweight are suspended by a main rope that is wound onto a driving sheave, a car suspending sheave, and a counterweight suspending sheave. A first main rope portion between the driving sheave and the car suspending sheave and a second main rope portion between the car suspending sheave and the car-side rope fastener portion are passed through a common car-side penetrating aperture so as to cross each other when viewed in an axial direction of the driving sheave. A third main rope portion between the driving sheave and the counterweight suspending sheave and a fourth main rope portion the counterweight suspending sheave and the counterweight-side rope fastener portion are passed through a common counterweight-side penetrating aperture that is disposed on the machine room floor so as to cross each other when viewed in the axial direction of the driving sheave.