Coaxial Brake Chain Disk Assembly for Door Operators
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Solution Overview
Problem
Existing integrated brake and chain disk assemblies for door operators require complex operation modes and additional mechanisms for manual operation during power failures, leading to increased complexity and potential maintenance issues.
Innovation Solution
A simplified integrated brake and chain disk assembly using a torsion spring mechanism with a clutch device and electromagnet, allowing for simultaneous braking and manual rotation of the main shaft without the need for additional release mechanisms, and integrating the brake, clutch, and chain disk devices coaxially for easier maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate brake releasing device is provided for manual operation mode, then the brake can be released during power failure, but the device complexity increases and operation becomes more complex
Solution Approach 1:
The brake device is integrated with the chain disk device into a single coaxial assembly. The brake disk is fixed on the chain disk, and both share a common rotational axis. This merging eliminates the need for a separate brake releasing device, as the chain disk rotation itself releases the brake through the interlocked mechanism.
Solution Approach 2:
The chain disk device serves dual functions: it acts as both the manual operation interface for rotating the main shaft and as the brake releasing mechanism. When the chain disk rotates in the manual operation mode, it automatically releases the brake without requiring a separate releasing device.
2Reliability
If a latch device is provided for locking the chain disk, then the chain disk can be held in motor operation mode, but the operation steps increase and time is lost
Solution Approach 1:
The brake device automatically engages and disengages based on the operational mode without requiring separate latch operations. In motor operation mode, the brake is automatically engaged when the chain disk stops rotating. In manual operation mode, the brake is automatically released when the chain disk rotates, eliminating the need for manual latch device operations.
3Device complexity
If brake device and chain disk device are integrated coaxially, then the structure is simplified and maintenance is easier, but the mechanical design becomes more challenging
Solution Approach 1:
The brake disk is nested on the chain disk, with both components sharing the same rotational axis. The brake disk is positioned such that its braking surface faces the brake arm, while the chain disk receives the chain. This nested coaxial arrangement integrates multiple functions within a compact structure, simplifying the overall assembly while maintaining manufacturability.
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 reliable operation without interference between brake and chain disk functions, reduces the need for additional operation steps during power failures, and simplifies the structure for easier installation and maintenance.
Implementation Method 1
at least one torsion spring with two free ends fitting on the first hub, when a force in a spiral direction of the torsion spring is exerted on either end of the torsion spring, the torsion spring tightly fits on the first hub and becomes immovable so that the main shaft is braked, and when a torsion force in a direction opposite to the spiral direction of the torsion spring is exerted on either end of the torsion spring, the torsion spring is loosened and released from the first hub
Data Source
AI summary
An integrated brake and chain disk device for a door operator includes an electrical motor with a main shaft coupled to a gear box for rolling a rolling door through an output shaft of the gear box; a brake device for braking the main shaft; a chain disk device for manually rotating the main shaft upon power failure; a clutch device which disengages the intermediate shaft from the chain disk device or engages the intermediate shaft with the chain disk device. The brake device includes at least one torsion spring fitting on a fixed hub. The torsion spring tightly fits on the hub and becomes immovable when a force in a spiral direction of the torsion spring is exerted on either end of the torsion spring, and can be released from the hub when a force in a direction opposite to the spiral direction of the torsion spring is exerted on either end of the torsion spring. In this way, the brake device and the chain disk device are integrated.