Elevator Position Tape Tensioning and Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing elevator position reference systems face accuracy and repeatability issues due to thermal elongation of measurement tapes, which affects position measurement accuracy.
Innovation Solution
The system employs tensioning of measurement tapes from both ends to evenly distribute thermal elongation and uses intermediate fixing devices to isolate tape portions, preventing vertical movement and mitigating elongation effects, thereby enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the position measurement tape is fixed at both ends to the hoistway wall, then the tape is stable and maintains its position, but thermal elongation causes measurement accuracy to deteriorate
Solution Approach 1:
The patent divides the position measurement tape into multiple segments by introducing intermediate support points (guiding clips) along the tape length. Each segment between support points can independently accommodate thermal expansion, preventing cumulative elongation errors across the entire tape length while maintaining overall tape stability through the support structure.
2Adaptability or versatility
If the tape is allowed to move freely vertically through clips, then thermal elongation can occur without constraint, but position measurement accuracy deteriorates due to unpredictable tape movement
Solution Approach 1:
The patent introduces guiding clips as intermediary elements that mediate between the tape and the hoistway structure. These clips provide controlled support points that allow the tape to adapt to thermal changes while maintaining predictable positioning, serving as intermediaries that enable thermal adaptation without compromising measurement repeatability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for accurate prediction and compensation of thermal elongation, maintaining measurement accuracy and reducing errors caused by tape elongation, ensuring precise position determination within the elevator hoistway.
Implementation Method 1
The accuracy and repeatability of position measurements in an elevator position reference system may depend on elongation phenomena affecting the tape due to temperature variations in the hoistway
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An elevator position reference system (1) comprises a hoistway (4) extending in a vertical direction and a position measurement tape (8) arranged in the hoistway (4) to extend in the vertical direction. An upper tensioning device (10) is connected to an upper end (20) of the position measurement tape (8) so as to apply a tensioning force (30) to the position measurement tape (8) in the upwards vertical direction. A lower tensioning device (12) is connected to a lower end (22) of the position measurement tape (8) so as to apply a tensioning force (32) to the position measurement tape (8) in the downwards vertical direction.