Brake Release Device for Fireproof Door Machines
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Solution Overview
Problem
Current door machines for fireproof doors require separate development and manufacturing processes from those for ordinary doors, leading to increased costs and complexity due to different functional requirements, and there is a need to prevent accidental activation of pull chain discs during emergencies.
Innovation Solution
A brake release device with a fusible link mechanism that allows a general door machine to function as a fireproof door machine by using a base plate, passive plate, sliding pin, spring element, and fusible link device to release the brake mechanically in case of high temperature, and a ring plate with plug pins to lock the pull chain disc, preventing erroneous activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate door machines are developed for ordinary doors and fireproof doors, then functional requirements are met, but development time and manufacturing costs increase
Solution Approach 1:
The brake release device is designed with a fusible link that responds to heat, enabling the same door machine to function in both ordinary and fireproof door applications. The device automatically releases the brake when exposed to high temperature, allowing the door to close freely for fire containment, while maintaining normal brake functionality for regular operation.
Solution Approach 2:
The brake release device utilizes temperature as a triggering parameter. The fusible link is designed to melt at a specific temperature threshold, transforming the brake from a mechanically-controlled component to one that responds to thermal conditions, thereby enabling fireproof door functionality without requiring a completely different door machine design.
2Reliability
If separate door machines are developed for ordinary doors and fireproof doors, then functional requirements are met, but manufacturing complexity and inventory costs increase
Solution Approach 1:
The brake release device serves dual purposes: it acts as a normal brake release mechanism for ordinary door operation and as an automatic fire response device for fireproof doors. This single component eliminates the need to manufacture and inventory two different types of door machines, reducing manufacturing complexity and inventory costs.
Solution Approach 2:
The fusible link acts as an intermediary element between the brake mechanism and the thermal environment. This simple melting component bridges the gap between mechanical brake control and fire response requirements, enabling a single door machine design to satisfy both ordinary and fireproof door functional requirements without complex modifications.
3Reliability
If the brake is released during fire emergencies, then door closure is enabled, but accidental activation by pull chain disc must be prevented
Solution Approach 1:
The brake release device is positioned and designed to respond specifically to high temperature conditions near the brake mechanism. The fusible link is located in a position where it is exposed to heat from fire, but not to the mechanical force applied to the pull chain disc, ensuring that only thermal conditions trigger brake release while manual operation remains effective for normal door control.
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 the use of a single door machine for both ordinary and fireproof applications, simplifying manufacturing, reducing development costs, and ensuring complete door closure during emergencies by preventing pull chain disc activation.
Implementation Method 1
when the surroundings temperature exceeds a melting point of the fusible link device, the fusible link device melts to release the connecting member connecting the sliding pin
Implementation Method 2
a spring element accommodated in the guiding hole, one end of the spring element abutting against the guiding member and the other end of the spring element abutting against the sliding pin in such a manner that the sliding pin is exerted by elastic potential energy
Implementation Method 3
the sliding pin slides toward the brake release bar so as to release the brake device, causing the sliding-down by the weight of the door slats
Data Source
AI summary
A brake release device attached to a door machine comprises a ring plate provided with a plurality of openings and fixed on a pull chain disc, a base plate located at the outside of the door machine, a passive plate provided with a plurality of plug pins that correspond to the openings of the ring plate and slides together with the sliding pin, a guiding member fixed together with the base plate, a sliding pin corresponding to a brake release bar for releasing brake of the door machine and slidably guided by the guiding member, a spring element and a fusible link device that curbs the sliding pin from leaving the brake release bar. By the spring element, the guiding member stores potential energy for sliding.