Electric Rolling Door Anti-Drop Device with Speed Detection
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Solution Overview
Problem
Conventional door curtain anti-dropping devices for electric rolling doors require cumbersome disassembly of the door operator to unlock the winding shaft after it has been locked, posing a challenge in efficiently managing abnormal drops.
Innovation Solution
A door curtain anti-dropping device equipped with a rotational speed detecting module, reducer mechanism, and brake mechanism, including an electromagnetic generator and centrifugal brake, that automatically locks the winding shaft with a small braking force when abnormal speed is detected, and features a manual brake releasing mechanism for easy unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional braking device is used to lock the winding shaft when the door curtain drops abnormally, then the winding shaft can be locked immediately, but it requires cumbersome disassembly of the door operator to unlock
Solution Approach 1:
The braking device is segmented into a fixed brake disc and a movable brake disc, allowing the movable brake disc to be independently actuated for locking while the fixed brake disc remains stationary. This segmentation enables the locking function to be isolated from the door operator assembly, facilitating easier unlocking without disassembling the entire door operator.
Solution Approach 2:
A movable brake disc is introduced as an intermediary element between the locking mechanism and the door operator. This movable brake disc can be independently controlled to engage or disengage from the brake pad, providing a convenient unlocking mechanism that does not require disassembly of the door operator while still ensuring reliable locking when needed.
2Speed
If a heavy braking force is applied to stop the winding shaft during abnormal drops, then the door curtain can be stopped immediately, but it may cause damage to the mechanism
Solution Approach 1:
The brake pad is designed with a cushioning structure that provides gradual engagement with the brake disc. This cushioning effect absorbs the shock during braking, allowing the winding shaft to decelerate smoothly from abnormal speed without subjecting the mechanism to sudden heavy forces that could cause damage, while still achieving timely stopping.
Solution Approach 2:
The braking force is made dynamic through the movable brake disc that can adjust its position and contact pressure. The brake mechanism applies controlled, progressive braking force rather than sudden maximum force, adapting the braking intensity to the situation to stop the door curtain efficiently while protecting the mechanical components from damage.
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
Enables immediate locking of the winding shaft during abnormal conditions while allowing for straightforward manual unlocking, thereby enhancing safety and operational convenience by reducing the need for extensive disassembly.
Implementation Method 1
an electromagnetic generator, surrounding the third rotating shaft, for generating an electromagnetic force to attract the movable brake disc
Implementation Method 2
an elastic element, disposed between the end plate and the electromagnetic generator, for pushing the movable brake disc away from the electromagnetic generator when the electromagnetic force is disappeared
Data Source
AI summary
A door curtain anti-dropping device comprises at least one rotating shaft, a brake mechanism, a rotational speed detecting module, and a control circuit, the rotating shaft being coupled to the winding shaft, the brake mechanism being used to brake the rotating shaft, the rotational speed detecting module being used to detect the rotational speed of the rotating shaft. When the door operator drives the winding shaft to rotate, the control circuit controls the brake mechanism to release the brake and to drive the rotating shaft and winding shaft. Once the chain is broken, an abnormal rotational speed of the winding shaft is detected by the rotational speed detecting module, the control circuit switches off the power source immediately to make the brake mechanism lock the winding shaft.