Elevator Load Measuring Device Using Beam Sensors
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Solution Overview
Problem
Existing elevator load measuring devices face inaccuracies due to temperature sensitivity and require a high number of sensors and signal connections, limiting their accuracy and accessibility.
Innovation Solution
A load measuring device for elevator installations that uses two sensors positioned on beams to detect compression and expansion, with material structures designed to amplify signal changes, allowing for high accuracy and reduced measurement errors, and is arranged to facilitate easy maintenance and minimal material processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used to measure load based on support deformation, then device complexity is reduced, but measurement precision deteriorates due to temperature sensitivity and other inaccuracies
Solution Approach 1:
The patent combines multiple sensors (at least two sensors per beam, totaling four or more) to measure load simultaneously. By merging the measurements from multiple sensors and evaluating their combined output, the system achieves higher measurement precision while compensating for individual sensor inaccuracies such as temperature sensitivity.
Solution Approach 2:
The patent implements feedback by continuously monitoring sensor signals and using evaluation logic to detect inconsistencies or errors. The system compares measurements from multiple sensors and adjusts or compensates for inaccuracies through this feedback mechanism, maintaining high measurement precision despite environmental variations.
2Measurement precision
If multiple strain gauges are used on each beam, then measurement precision improves, but device complexity and number of signal connections increase
Solution Approach 1:
The patent segments the measurement function by distributing sensors across multiple beams rather than concentrating many sensors on a single beam. This segmentation reduces the number of connections required per measurement point while maintaining overall measurement precision through the combined output of distributed sensors.
Solution Approach 2:
Each sensor serves multiple functions: it measures load, provides temperature compensation data, and contributes to error detection. This multi-functionality reduces the need for additional dedicated sensors or connection channels, thereby reducing overall device complexity while maintaining high measurement precision.
3Measurement precision
If sensors are positioned to maximize signal detection, then measurement precision improves, but ease of repair deteriorates due to limited accessibility
Solution Approach 1:
The patent positions sensors on multiple beams in different spatial locations rather than optimizing all sensors for maximum signal in a single plane. This dimensional distribution allows sensors to be accessed from different sides or directions, improving ease of repair while maintaining sufficient signal strength through the combined measurements from all sensor locations.
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
The solution achieves high measuring accuracy with a reduced number of sensors, compensates for measurement errors, and simplifies maintenance, while minimizing material usage and sensor exposure.
Implementation Method 1
a first sensor is arranged at a first material structure and a second sensor at a second material structure so that a change in spacing at a material structure is converted into a change in a sensor signal generated by a sensor
Implementation Method 2
WO 01/83350 describes a principle of a load measuring device for cable elevators, in which a single sensor generates a signal on the basis of the extent of deformation of a support carrying the elevator cage
Data Source
AI summary
An elevator installation includes an elevator cage with a support construction carrying the elevator cage, wherein the support construction has two beams. Mounted on each beam is a positioning arrangement on which a sensor is positioned, which is part of a load measuring device, wherein the positioning arrangements have material structures. The sensors detect a change in spacing of the material structures from one another, wherein this change in spacing is caused by a change in loading of the elevator cage. Signals of the sensors are processed in an evaluating unit and a signal representing the loading is used in an elevator control.