Elevator Synchronous Door Knife Integrated Blade Design
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Solution Overview
Problem
Existing synchronous door knives for elevators have an unreasonable structure, making them difficult to debug, leading to long door opening times and a high risk of mechanical failure or crashing, especially when the landing door ball is offset-mounted.
Innovation Solution
A simplified elevator synchronous door knife design integrating a door closing blade and unlock blade into a single blade, using a four-bar linkage mechanism with a guide wheel and reset springs to ensure consistent operation and easy adjustment, allowing the second blade to function as both a closing and unlock blade, reducing the need for precise alignment and simplifying the mechanical structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional three-blade synchronous door knife structure is used (with separate door opening blade, door closing blade, and unlock blade), then the door can be opened when the landing door ball is offset-mounted, but the door cannot be opened when the landing door ball is offset-mounted away from the unlock blade and mechanical reopening takes too long or causes crash
Solution Approach 1:
The patent merges the door closing blade and unlock blade into a single integrated blade structure. This integration eliminates the need for separate unlock blade positioning relative to the landing door ball, allowing the door to open reliably regardless of whether the ball is offset-mounted or not, thus resolving the contradiction between opening reliability and operational ease
Solution Approach 2:
The integrated blade performs multiple functions simultaneously - it acts as both the door closing blade and the unlock blade. This multi-functionality ensures that the same blade structure handles both normal door closing and unlocking operations, eliminating the need for precise positioning of a separate unlock blade and enabling reliable door opening in all mounting configurations
2Reliability
If a traditional three-blade synchronous door knife structure is used, then the unlock function can be achieved, but the structure is complex and difficult to debug
Solution Approach 1:
By combining the door closing blade and unlock blade into one integrated blade, the patent reduces the number of mechanical components from three separate blades to two blades (door opening blade and integrated closing/unlock blade). This simplification reduces structural complexity and makes debugging easier while maintaining the unlock function through the integrated blade's dual role
3Reliability
If a traditional three-blade synchronous door knife structure is used with precise alignment requirements, then the unlock function works correctly, but the debugging time is long and the system is not easy to debug
Solution Approach 1:
The integrated blade that serves as both door closing blade and unlock blade eliminates the need for precise alignment between a separate unlock blade and the landing door ball. Since the same blade performs both functions, the positioning requirements are significantly relaxed, reducing debugging time and making the system easier to install and adjust
Data Source
AI summary
A synchronous door knife includes a track frame and a bottom plate, the back of the bottom plate is hinged with a stop arm, a transmission arm and a lock plate, a front end of the stop arm is provided with a guide wheel, upper and lower portions of the front of the bottom plate are respectively hinged with rotating arms, the upper rotating arm is linked with the transmission arm through a draw bar, one end of the rotating arms is hinged with a first blade, the other end is hinged with a movable plate, the movable plate is hinged with unlock rotating arms, one end of the unlock rotating arms is hinged with a second blade, and the other end abuts against the lock plate.