Escalator Drive Element Monitoring for Speed Control Safety
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Solution Overview
Problem
In escalators or moving walkways where the drive motor is positioned outside the step or pallet belt and connected via a drive means, there is a lack of control over the speed in case of damage to the drive means, posing a risk of personal injury due to uncontrolled movement.
Innovation Solution
A method and device that monitor the condition of both the steps/pallets and the drive element, using sensors to detect deviations in frequency and pulse sequences, activating a mechanical emergency brake to stop the belt when malfunctions occur, ensuring safety within predetermined tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the drive motor is positioned outside the step or pallet belt and connected via a drive means, then the structural layout is improved and maintenance is easier, but there is a lack of control over the speed in case of damage to the drive means
Solution Approach 1:
The patent implements feedback monitoring by detecting the actual speed of the step or pallet belt and comparing it with the expected speed based on drive motor operation. Sensors monitor the belt's movement and provide feedback signals to the control system, enabling real-time detection of speed deviations caused by drive means damage.
Solution Approach 2:
The patent replaces direct mechanical coupling monitoring with electrical/sensor-based monitoring systems. Instead of relying solely on mechanical connection integrity, the system uses sensors to detect belt speed and position, substituting mechanical monitoring with electrical measurement and control.
2Adaptability or versatility
If the drive motor is positioned outside the step or pallet belt, then the design flexibility is improved, but there is no more control over the speed of the step or pallet belt in case of drive means damage
Solution Approach 1:
The system uses feedback from speed sensors and position sensors to continuously monitor the actual belt speed and compare it with expected values. This feedback mechanism enables the control system to detect and respond to speed deviations caused by drive means damage, maintaining safety despite the separated motor positioning.
Solution Approach 2:
The patent implements preliminary monitoring and detection systems that identify drive means damage before it causes uncontrolled belt movement. By continuously monitoring belt speed and position, the system can detect anomalies early and activate safety mechanisms in advance.
3Reliability
If monitoring systems are added to detect drive element malfunctions, then safety is improved, but the device complexity increases
Solution Approach 1:
The patent employs multi-functional sensors and monitoring systems that serve multiple purposes. The same sensors used for normal operation monitoring also detect drive means damage, and the control system performs both speed control and safety monitoring functions, reducing the need for separate dedicated safety components.
Solution Approach 2:
The patent combines the monitoring functions into an integrated system where the control system simultaneously handles drive control and safety monitoring. The evaluation and control electronics unit processes both operational parameters and safety signals, merging multiple functions into a single integrated system.
Data Source
AI summary
A method and device for monitoring the functioning of a drive element provided between a drive motor and a pulling member for pallets or steps of a passenger transport installation is provided. The condition of the steps or pallets of the step or pallet belt may be monitored. The drive element may be monitored. The step or pallet belt may be stopped in the event of a malfunction of the drive element.