Elevator Cab Position Measurement Using Tape and Reference Marking
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Solution Overview
Problem
Existing elevator installations face challenges in accurately determining the position of the elevator cab within the shaft, particularly in maintaining alignment and correcting for displacements relative to level openings, often requiring multiple sensors and being susceptible to structural changes.
Innovation Solution
The implementation of a measurement tape with a code and a sensor apparatus on the elevator cab, including an illumination source and a sensor, along with a guide element and marking element that uses a reference marking to align the position determined by the tape, allowing for continuous position information and dispensing with additional sensors by utilizing a dual-function guide element that also serves as a mounting mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to detect both the measurement tape and reference marking, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The sensor apparatus is designed to perform multiple functions: it detects both the measurement tape for continuous position information and the reference marking for alignment correction. This multi-functionality eliminates the need for separate sensors, reducing device complexity while maintaining detection accuracy
Solution Approach 2:
The functions of detecting the measurement tape and detecting the reference marking are merged into a single sensor apparatus. The sensor apparatus includes an illumination source and sensor that can identify both the code on the measurement tape and the reference marking, thereby simplifying the overall system structure
2Stability of the object's composition
If the measurement tape is rigidly fixed to maintain position, then alignment stability is improved, but adaptability to structural changes decreases
Solution Approach 1:
The measurement tape is designed to be movable within guide elements rather than rigidly fixed. This dynamic configuration allows the tape to adapt to structural changes in the elevator shaft while the evaluation apparatus continuously corrects alignment based on reference markings, maintaining both stability and adaptability
Solution Approach 2:
The evaluation apparatus uses reference markings to detect alignment deviations of the measurement tape and automatically corrects these deviations. This feedback mechanism ensures that even if the tape shifts due to structural changes, the system maintains accurate position determination by realigning the tape position to the reference marking
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 solution enables precise alignment of the reference marking with the measurement tape using a single sensor, allowing for continuous position monitoring and correction of tape displacements, while minimizing interference from structural changes and eliminating the need for extra components, thus enhancing the accuracy and reliability of elevator positioning.
Implementation Method 1
a sensor apparatus which is attached to the elevator cab and comprises an illumination source and a sensor, which form a detection field for detecting the measurement tape
Data Source
AI summary
An elevator installation with an elevator cab in an elevator shaft and a measurement tape for determining the position of the elevator cab within the elevator shaft, which measurement tape is arranged vertically in the elevator shaft and has a code along the measurement tape, and at least one marking element which is attached in the elevator shaft and has a reference marking, and a sensor apparatus which is attached to the elevator cab and includes an illumination source and a sensor, which form a detection field for detecting the measurement tape and with an evaluation apparatus. The reference marking is arranged such that it can be captured by the detection field and the sensor apparatus is also provided for detecting the reference marking and the evaluation apparatus aligns the position determined by the measurement tape with the reference marking.