Winding Shaft Locking via Latching Pin Gear Engagement
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Solution Overview
Problem
Large-sized rolling doors are at risk of catastrophic damage and safety hazards due to chain breakage in the reel mechanism, which is difficult to predict or prevent, especially in high-frequency use scenarios like warehouses, leading to potential door curtain drops under gravitational force.
Innovation Solution
A door curtain anti-dropping device with a latching pin locking mechanism that acts on the shaft adaptation system between the door operator and the winding shaft, locking the winding shaft when the worm wheel gear teeth are excessively worn or broken, utilizing a gearbox with a worm, drive shaft, worm wheel, driven wheel, limiting disc, and latching pins to ensure safety and simplify the shaft transmission system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a chain and sprocket reel mechanism is used in large-sized rolling doors, then the mechanism can support heavy door curtains (several tons), but the chain may break due to repeated wear from high-frequency use, causing the door curtain to drop under gravitational force
Solution Approach 1:
The latching pins are pre-positioned in the gear teeth of the worm wheel and driven wheel, ready to engage and lock the winding shaft before any catastrophic failure occurs. This preliminary arrangement ensures that when wear or breakage is detected, the locking mechanism is already in place to prevent door curtain dropping.
Solution Approach 2:
The invention provides a safety buffer by incorporating latching pins that act as a backup locking mechanism. This beforehand cushioning measures prevents the harmful effect of chain breakage by having a pre-prepared locking system that engages when the primary chain-sprocket mechanism fails or shows signs of failure.
2Productivity
If the operating speed of the electric rolling door is increased for energy saving and preventing warm air leak, then the service life of the rolling door is shortened due to accelerated wear of the chain and gear
Solution Approach 1:
The invention incorporates a wear detection mechanism that monitors the condition of the chain and gear components. When wear reaches a predetermined threshold, the system provides feedback that triggers the latching mechanism to engage, preventing further operation that would cause complete failure. This feedback loop allows the system to operate at high speeds safely until wear indicators signal the need for maintenance.
3Reliability
If the latching pin locking mechanism is added to the shaft adaptation system, then the safety against door curtain dropping is improved, but the device complexity increases
Solution Approach 1:
The latching pin locking mechanism is merged with the existing shaft adaptation system between the door operator and winding shaft. The latching pins are integrated into the gear structure of the worm wheel and driven wheel, combining the locking function with the existing transmission components rather than adding a separate, complex locking system.
Solution Approach 2:
The gear teeth of the worm wheel and driven wheel serve dual functions: they transmit rotational motion for door operation and simultaneously serve as the locking structure for the latching pins. This multi-functionality eliminates the need for separate locking components, reducing overall device complexity while maintaining safety.
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 device effectively prevents the door curtain from dropping by locking the winding shaft when gear teeth wear or break, enhancing safety and reducing manufacturing costs through a compact, low-vibration, and low-noise design, while maintaining operational stability.
Implementation Method 1
a worm 21, a drive shaft 22, a worm wheel 23
Implementation Method 2
The worm wheel 23 has a plurality of elongated slots 231 on the radial end face
Implementation Method 3
a plurality of latching pins 27...locking the winding shaft when the gear teeth of the worm wheel are excessively worn or broken
Data Source
AI summary
A door curtain anti-dropping falling device for a rolling door is provided. The device comprises a worm connected to the output shaft of the door operator, a drive shaft driving the winding shaft, a worm wheel having plural oblique elongated grooves and fixedly mounted on the drive shaft and meshes with the worm, a driven wheel having plural oblique elongated holes and is driven by the worm to move synchronously with the worm wheel, a limiting disk for restricting the driven wheel from moving axially, and plural latching pins extending through the elongated holes and received in the elongated slots. Under the normal operation of the door operator, the latching pins are retained in the center positions of the elongated holes and grooves. When the worm wheel are excessively worn and dislocated from the driven wheel, the latching pins lock the worm wheel and stop the winding shaft from rotating.