Escalator Braking System Using Variable Frequency Control
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Solution Overview
Problem
Existing escalator braking systems face challenges in controlling braking force due to the instability of elastic elements and the difficulty in adjusting braking distances based on different failure types, leading to safety risks and frequent maintenance needs.
Innovation Solution
An escalator braking system that combines a failure monitoring device for classifying failure information with an image acquisition and processing system to determine a braking mode, using a variable frequency driver and electrically controlled brake lining to control braking distances, including modes for short, medium, and long braking distances, and deceleration-to-zero stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical braking with elastic elements (springs) is used to brake the escalator rotor, then braking force can be applied, but the braking force control is difficult and braking distance cannot be adjusted according to different failure types
Solution Approach 1:
The patent replaces static mechanical spring-based braking with dynamic electrical braking control. The variable frequency driver dynamically adjusts braking parameters based on real-time feedback from the braking distance detection device, enabling adaptive braking distance control for different failure types without manual adjustment of mechanical components.
Solution Approach 2:
The patent changes the control parameter from mechanical spring compression to electrical frequency and voltage control. By varying the frequency and voltage parameters of the variable frequency driver, the system can precisely control braking force and braking distance according to different failure scenarios.
2Reliability
If elastic elements are used to apply brake force, then mechanical braking can be achieved, but the elastic elements are unstable and require frequent maintenance
Solution Approach 1:
The patent replaces the mechanical elastic element-based braking system with an electrical braking system. The variable frequency driver controls the motor to provide braking torque, eliminating the need for physical contact between brake linings and rotors, thereby removing the instability and maintenance issues associated with mechanical elastic elements.
Solution Approach 2:
The electrical braking system is self-regulating through feedback control. The braking distance detection device continuously monitors braking performance and automatically adjusts the variable frequency driver parameters to maintain optimal braking distance, eliminating the need for manual maintenance and adjustment of mechanical components.
3Measurement precision
If braking control is based only on failure information monitoring, then braking can be triggered, but the braking control is not applicable to the actual scene and safety risks remain
Solution Approach 1:
The patent introduces a feedback loop where the braking distance detection device continuously measures actual braking distance and feeds this information back to the variable frequency driver. This closed-loop control enables real-time adjustment of braking parameters to match actual scene requirements, significantly improving braking control accuracy and safety.
Solution Approach 2:
The patent adds a spatial dimension to braking control by incorporating braking distance measurement as a critical parameter. Instead of relying solely on failure type classification, the system now considers actual braking distance achieved, enabling more precise and scene-appropriate braking control decisions.
Data Source
AI summary
The present invention provides an escalator braking system and an escalator braking control method, belonging to the field of escalator braking control technology. In the escalator braking system and the escalator braking control method according to the present invention, a braking mode is determined based on the classification of failure information in combination with the corresponding image information, and a braking device is controlled based on the braking mode, so that the braking is more intelligent, scientific and accurate, the occurrence of security problems caused by the failure can be effectively prevented, and the probability of accident is reduced.