Rolling Door Governor Device Prevents Gear Abrasion Stalling
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Solution Overview
Problem
Conventional door systems, particularly rolling doors, face safety risks due to gear abrasion in the reel mechanism, which can lead to stalling and falling if not detected effectively, as the focus has been on higher failure probability mechanisms like the control system, neglecting the potential danger of reel mechanism wear.
Innovation Solution
A governor device comprising an input shaft, hollow shaft, third shaft, brake device with active and passive gears, idle wheel, and clutch mechanism to synchronize rotation and prevent abnormal speed changes, locking the reel to prevent falling and protect the transmission mechanism from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reel mechanism is used for driving the door, then the failure probability is reduced and safety is improved, but gear abrasion occurs after long-term usage which can cause stalling and falling
Solution Approach 1:
The governor device performs preliminary detection of gear abrasion through speed monitoring before the reel mechanism fails. By detecting abnormal speed changes early in the wear process, the system can activate protection mechanisms in advance, preventing stalling and falling even after long-term usage.
Solution Approach 2:
The system continuously monitors the rotation speed of the reel and compares it with expected values. When gear abrasion causes abnormal speed changes, the feedback mechanism triggers the clutch to disengage or the brake to activate, creating a closed-loop control system that adapts to wear conditions.
2Device complexity
If no detection mechanism is implemented for gear abrasion, then the device complexity is reduced, but the danger of stalling and falling increases
Solution Approach 1:
The governor device uses the existing rotation speed signal from the reel mechanism itself as the detection parameter. By monitoring the speed that is already present in the system, the device achieves self-detection capability without adding separate complex sensing systems, thus protecting against stalling while minimizing added complexity.
3Reliability
If the clutch mechanism locks the hub to prevent fast falling, then safety is improved, but the transmission mechanism may be damaged if power is not cut off
Solution Approach 1:
The clutch mechanism provides dynamic protection by locking the hub only when abnormal speed changes indicate gear abrasion. The system adapts its state based on real-time conditions, engaging the clutch to prevent fast falling while allowing normal operation when conditions are acceptable, thus balancing safety with transmission protection.
Solution Approach 2:
The governor device prepares for potential transmission damage by providing a cushioning protection mechanism. When gear abrasion is detected, the clutch engages to lock the hub, preventing the harmful effect of fast falling before it can damage the transmission mechanism, effectively cushioning against the potential harm.
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
Enhances safety by preventing gear abrasion-induced stalling and falling of rolling doors, ensuring the reel mechanism's safety through synchronized rotation and overload protection without damaging the transmission mechanism.
Implementation Method 1
The rotational transmission between them is conducted by the frictional contact of both with an elastic body which is pressed and deformed by both
Implementation Method 2
an elastic body which is pressed and deformed by both
Data Source
AI summary
This invention disclosed a speed limit device for door, which comprises: an input shaft with one end driven by a door motor, and having the first gear and the second gear configured at the other end simultaneously driving a hollow shaft and a third shaft, and the center of the hollow shaft accommodates and fixes one end of a reel, and the third shaft is connected with an extension shaft; a brake device, which includes an active gear fixed with the extension shaft; a passive gear is pivoted on a hub, and the hub is fixed with the reel and rotating with the hollow shaft; an inert wheel located between the active gear and the passive gear to adjust the passive gear to have the same rotation speed with the hollow shaft; a clutch mechanism, which could restrain the synchronous operation between the passive gear and the hub without any positional difference, and when the rotation speed of the reel has the abnormal change, the clutch mechanism generates the positional difference condition necessary to lock the hub to a fixed object to prevent the rolling door from falling.