High-Speed Door Braking Device Prevents Unintended Closure
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Solution Overview
Problem
High-speed doors with vertically running door leaves face issues with unintended closure due to their intrinsic weight, particularly when the drive is switched off or fails, leading to potential safety and operational challenges.
Innovation Solution
A braking device is integrated into the door system that provides constant braking force in the closure direction, preventing the door leaf from moving solely by its weight, even when the drive is off or faulty, and is designed to relieve the braking force in the opening direction to enhance speed and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking device is constantly effective in the closure direction to prevent unintended door closure, then safety and reliability are improved, but the complexity of the drive system increases
Solution Approach 1:
The braking device functions as a counteracting force mechanism that continuously applies a braking torque to the shaft to prevent unintended door closure. The brake counteracts the weight force of the door leaf, ensuring the door cannot close solely due to its intrinsic weight even if the drive fails or is switched off.
Solution Approach 2:
The braking device is designed to be constantly effective without requiring continuous active control or monitoring systems. Once installed, the brake automatically provides the necessary braking force to prevent unintended closure, making the system self-regulating and reducing the need for additional safety monitoring complexity.
2Reliability
If a mechanical brake is applied between the door leaf and guide to prevent unintended closure, then safety is improved, but the opening speed and efficiency are reduced
Solution Approach 1:
The braking device is designed with asymmetric braking characteristics: it applies strong braking force in the closure direction to prevent unintended closing, but reduces or releases the braking force in the opening direction. This allows the door to open at high speed while maintaining safety against unintended closure.
Solution Approach 2:
The braking force is made dynamic rather than static - the brake can adjust its braking force based on the direction of movement. The brake is constantly effective in the closure direction but can be relieved or reduced in the opening direction, optimizing both safety and operational performance.
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 braking device ensures reliable prevention of unintended door closure, maintaining operational safety and efficiency by ensuring the door can only be moved with the assistance of the drive, while reducing the load on the drive during opening, thus allowing for faster operation.
Implementation Method 1
a mechanical brake which is effective between the door leaf and a lateral guide of the door leaf
Data Source
AI summary
A door includes a door leaf (1) with a vertical running direction and a drive (7) for opening and closing the door. A braking device (8) is provided, and this is configured such that the door leaf (1) cannot be moved in the closure direction solely by a weight force thereof, but only with the assistance of the drive (7).